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初二版
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第636期
SCIENCE STUDY
Clock makes you yawn
初二
第636期
作者:teen
Aa
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叮铃铃,现在该睡觉啦!
Do you become sleepy when you see or hear others yawning (打哈欠)? Most people do, in fact. Some clock designers (设计师) from India have made a clock that “yawns” and helps you go to sleep on time.
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