以下为句子列表：
英文: We all know that normal human daily cycle of activity is of some 7-8 hours' sleep alternating with some 16-17 hours' wakefulness and that,broadly speaking,the sleep normally coincides with the hours of darkness.
中文: 我们都清楚正常人每天的活动周期是大约7-8个小时睡眠和16-17个小时清醒轮流相互交替，我么也知道，一般来说，睡眠常在夜间进行。
更详细...
|
