He spent about twenty-one hours in space. He did a lot of work there.
他在太空中度过了大约二十一个小时。在那儿他做了很多工作。
Would not the light be fading at twenty - one hours on an August evening?
难道八月里的夜晚，到了二十一点，天还没有黑? ?。
This drug has one important limitation. Its effects only last six hours.
这种药物有一个很大的限制因素，其药效只能持续6个小时。
One and a half hours are allowed for the exam.
考试时间为一个半小时。
One 60-minute run can add seven hours to your life.
一次60分钟的跑步可以为你的寿命延长7个小时。
Take one tablet every four hours.
隔四小时服一片。
One person may spend hours on the phone, while another rarely makes calls.
一个人可能花几个小时打电话，而另一个人很少打电话。
I can stand on one toe for hours.
我可以用一只脚趾站上好几个小时。
I have to take one every three hours, he said.
我必须每隔三个小时就得吃一粒，他说。
But one or two hours might not be enough, the US researchers found.
但美国的研究者们发现，一两个小时可能是不够的。
One way to do indispensable work is to show up more hours than everyone else.
完成必不可少的工作的方法之一就是拿出比比别人更多的时间。
Choose one or two groups, and donate a few hours of your time a week.
选择一个或两个团体，每周拿出几个小时的时间。
One night, after hours of stirring, you finally fall asleep and begin to dream.
一天晚上，脑子混沌了好几个小时后你终于睡着了，然后做了一个梦。
They normally build one made of snow, for survival courses, within three to four hours.
在锻炼生存能力的课堂上，他们通常在三四个小时内就能搭建出一座雪屋。
The entire procedure is usually completed within one to three hours.
整个过程通常在一至三个小时内完成。
I was one of the lucky ones, going without power for about four hours.
我属于幸运的一户，电只停了大约四个小时。
Commute up to four hours a day to work in the city center. One professor.
他们每天花长达四小时往返唐家岭和北京市中心的工作地。
One Earth day is about 24 hours, or 86,400 seconds, long.
地球上的一天是24小时，或8.64万秒。
In one trial a satellite was assembled in less than four hours.
在一次试验中，一颗卫星不到4小时就组装好了。
We were so demoralized by that one wrong turn that were lost for hours.
因那个错误的转弯，我们迷路数小时，这使我们陷入混乱。
These small tablets contain one drop of hydrochloric acid and they last about four hours.
这些小片剂每片含有一滴盐酸，药效持续四个小时左右。
For many people this one change will free up a couple hours or more.
对于很多人来说，这一项改变可以节约我们数个小时或者更多。
For the next few hours, I am the one who commands.
接下来的几个小时里，由我来发号施令。
We have waited here for one or two hours.
我们在这里已经等了一两个小时了。
She usually spends one or two hours on it.
她常常花费一或两个小时来完成作业。
She usually spends one or two hours on it.
她常常花费一或两个小时来完成作业。
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