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| 该睡觉啦! | |
| 摘 要： | Sleep is important!We need sleep to make us healthy and happy!Every living thing sleeps, from insects to whales. Some animals sleep 20 hours a day! Most people don't need to sleep so many hours, but our sleep is also important. |
Time to Sleep! |
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| 本文献已被 万方数据 等数据库收录！ | |