Meiluo Primary School: Yang Tianrong
The Mystery of the Aerial Thief-The Mystery of the Footprints (Final draft)
After a period of preparation, the annual Mathematics Olympiad in Huachuan City finally began. Dan Zi and Bei Le represented Baiyun Primary School in the city to participate in the Mathematics Olympiad. After the competition, Bei Le and Billiard stayed at Bei Le's uncle, Captain Bei's house. It was a sunny morning after the rain. Billiard and Bei Le accompanied Captain Bei on a walk on the street covered by green. They saw new green leaves with pure and sparkling water droplets hanging on them. In the washed air, the crisp and pleasant sound of a flute was scattered.. Occasionally, there would be a slight breeze that would lift the leaves and roll up the curtains of the houses in the city. They passed through an alley by the market and soon saw the fiery red observation deck across the park. Bei Le and Billiard were excited. They left Captain Bei behind and ran over in one breath. They climbed up the observation platform and stood proudly on the fiery red observation platform. They shouted to the detective who came after them,"Uncle, come quickly, it's so cool here!”The two of them admired the spectacular view of the observation platform at the same time.
The observation platform was located by the Egret Lake. It was 36 meters high and covered an area of 1500 square meters. It was narrow at the bottom and wide at the top. It was an inverted cylinder with a majestic aura, like the head of a giant dragon. There was an attached rotating ladder from top to bottom for people to go up and down. The entire building was built on the mountain, its shape simple and dignified, and its momentum majestic. On the stage, overlooking the railing, the beautiful scenery of the whole city was unobstructed. The great detective panted as he came to the observation platform. He was no longer interested in climbing up the stage. He wiped his sweat and swung his arms to stretch his muscles.
"Hey, you're coming down. Turn to Century Square! " It's too beautiful, I really can't bear to leave."" Haha-" They laughed and laughed for a while, and then came to the square. The area had formed a commercial leisure area of 10 square kilometers. Some places were under construction. Just as they were taking a walk in the square, they suddenly noticed a row of people on the ground in the middle of the field. "That's impossible, right? " There's a porter coming to work so early-" Captain Bei was still puzzled when the staff at the square reported," When they went to work, they found that the two piles of steel bars in the open shed in the square were missing. It was worth about 20,000 yuan.
Bei Le and Billiard stuck out their tongues." That's amazing. Just tell me the case, and the case will come. Uncle was right."”
They began to inspect the scene. Building materials were piled up in a mess in the warehouse, and the footprints were messy.
"Didn't you send someone to be on duty?" Captain Bei asked. "Yes. However, the person on duty fell ill at about three o'clock last night and was still in the hospital for an infusion.”the staff replied. Outside the warehouse was the square. If the criminal wanted to transport the steel bars, he would at least need a means of transportation. Secondly, the square was the only way. However, the ground that had been washed by last night's rain only left behind a pole. Other than that, there were no footprints.
How strange. Why were there no traces of wheels or footprints? It must have been done before or during the rain. Bei Le said.
No, if that was the case, the pole should have been wet or moved by the rain. They were still doing their bickering. It meant that the crime was committed here after the rain stopped. Captain Bei concluded.
So, how could the thief leave such a wide square without leaving any traces?”Bei Le was confused.
"They must have used their hands or brooms to destroy the tracks of the wheels and their own footprints before escaping," said Ball.
If he did that, there would still be traces of destruction. Although the ground had been washed by the rain, it was clean and there was nothing.”Bei Le shook his head.
"He ran away on the edge of a quarrel," said the marble.”Captain Bei smiled and said," The bickering is rolling. It's impossible for people to step on it and escape. Besides, there are tire marks.”
Then, could it be a wheelless flying car driven by a flying pirate? said the marble.
It was impossible for such a strange case to exist. Captain Bei replied.
However, I couldn't think of any other possibility. Could it be that the thief had grown wings and flew from the sky to steal the steel bars? It was impossible. The marble was also at a loss.
Captain Bei was also troubled. He came to Inspector Belle, who was deep in thought, and suddenly took out his phone. "Uncle-what are you doing?" Ball asked. " Uncle is booking a prize for little Holmes-" Captain Bei deliberately kept Bei Le in suspense. Billiard came to Bei Le's side and nudged him.""It's up to you! " I'll try to make Uncle spend money…" Bei Le blinked strangely and looked around carefully. His eyes suddenly focused on the four-meter-tall red reinforced wall in the corner of the square. It was a protective fence made of steel pipes and fine wires of the same size. In the middle of each group of fences was a rice-shaped or peach-shaped window. Near the reinforced wall was a faucet for washing hands. Bei Le walked over in deep thought and stopped beside the faucet. He touched the faucet with one hand and looked up at the reinforced wall at the same time. He grabbed the steel bars with his hand and climbed up step by step on the window. He then effortlessly flipped over to Harrier and stepped over. He grabbed the steel bars on the top and stepped on the window with both feet. He stood outside the reinforced wall and reached his hand through the window. Then, he touched the faucet and turned it on. I see. Uncle, I've figured it out.”He said excitedly," The thief used extremely simple means to destroy the traces at the scene.
The mystery of the traces at the scene was finally solved.
Then, what method was it?
Answer:
He used a glue tube to erase the traces.
He put the glue tube on the faucet and turned on the switch. He washed the traces of the scene first and then left the scene while washing the footprints. Finally, he climbed over the reinforced wall and reached his hand through the reinforced flower window to turn off the faucet. Then, he pulled out the water pipe and left.
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