成年人
word C2- adult person
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专家建议，成年人每晚应保证七到九个小时的睡眠，而青少年需要的更多。
无论是成年人还是儿童，我们的日程表总是被各种工作、学习和娱乐活动塞得满满当当。
对于忙碌的成年人而言，刻意在日常生活中为自己创造一些无聊的时间同样具有不可估量的价值。
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