hour

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hour的基本意思是“小时”,即60分钟,是可数名词; 也可指“钟点”,如一点钟、两点钟等,用于正式文体中可用于24小时计时制,但常用复数形式。
hour还可用于表示工作、设施等的“固定时间”,常用复数形式; 也可表示“不确定的一段时间”,常用单数形式; 还可作“某一时刻”解,常用单数形式。
hour还可表示“一小时的时间或行程”,为可数名词。
hour与缩略词am或pm连用时,通常要用数字表示。
hour在句中有时也可用作定语。
after hours的意思是“下班后”; at〔till〕 all hours的意思是“在〔到〕任何时候也没关系”; at the eleventh hour的意思是“在最后时刻”或“刚好来得及”; on the hour的意思是“在某一整点”; out of hours的意思是“在工作时间之外”。

An hour is a period of sixty minutes.
People say that something takes or lasts hours to emphasize that it takes or lasts a very long time, or what seems like a very long time.
A clock that strikes the hour strikes when it is exactly one o'clock, two o'clock, and so on.
You can refer to a particular time or moment as a particular hour.
If you refer, for example, to someone's hour of need or hour of happiness, you are referring to the time in their life when they are or were experiencing that condition or feeling.
You can refer to the period of time during which something happens or operates each day as the hours during which it happens or operates.
If you refer to the hours involved in a job, you are talking about how long you spend each week doing it and when you do it.
&rarrsee also rush hour
If you do something after hours, you do it outside normal business hours or the time when you are usually at work.
If you say that something happens at all hours of the day or night, you disapprove of it happening at the time that it does or as often as it does.
If something happens in the early hours, in the small hours, or in the wee hours, it happens in the early morning after midnight.
If something happens on the hour, it happens every hour at, for example, nine o'clock, ten o'clock, and so on, and not at any number of minutes past an hour.