Most people require between 7 and 8 hours each night. If needed, set a bedtime reminder alarm on your alarm clock.

大多数人每晚需要7-8小时睡眠，如果需要的话，在你的闹钟上设置一个睡前提醒闹铃。

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The natural waking process helps to set "body clock" and makes people build a healthy sleep and wake habit slowly.

自然清醒的过程有助于设定“生物钟”，让人们建立一个健康的睡眠和慢慢醒来的习惯。

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For instance, if a homing pigeon is to navigate with its Sun compass, its clock must be properly set by cues provided by the daylight/darkness cycle.

例如，如果一只信鸽要用它的太阳罗盘进行导航，它必须根据日光/黑暗的循环所提供的线索正确设置时间。

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That's correct. So her answer was, if it was a full parabola, then we know it would've been at the ground before I set my clock to 0.

她说,如果运动轨迹为一条完整的抛物线,那么它在我们所设定的零时刻之前,就已经落地了

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You can watch television, access the internet, use email, obtain weather reports, set an alarm clock, keep a calendar, use GPS and maps to gain directions, take photos, etc.

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So show up a little early--8:00 p.m. for a 9 o'clock set (which usually starts late).

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From practical necessities such as an alarm clock or a new set of linens to fashionable indulgences such as high-end headphones, we firmly believe there is no reason for anyone--much less a college student--to fork over the big bucks to live the good life in the dorm.

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