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Last Friday I took the subway home as usually. Since our physics teacher had just teach us in class that the escalator£¨×Ô¶¯·öÌÝ£© worked, I decided to see how fast the escalator went. To my surprise, it went a speed of about 40 m/min. The next day, I went to a department store with her cousin Emily. I times the escalator here too. I found that it was much slower, going about 30 meter every minute. Why? I check on the Internet and found the reason. Stores slow down escalators on a purpose, allowing customers more time to looking at their products.
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