I've done it for a week or two at a time, basically sleeping only about 2-4 hours a night, without any apparent ill-effects during the day.
我每周会有一到两次，每晚就睡2到4个小时，但对白天的工作却没有任何影响。Total eclipses occur about twice a year as the moon passes between the Earth and the sun on the same plane as Earth's orbit.
日全食每年出现大约两次，那时月亮运行的轨道平面至与地球轨道平面重合并且月亮正好处于日地连线之间。He comes to see use at least twice a week.
他一周至少两次来看望我们。May be my nature to be favorable and do not like fun. Moreover, I also have drunk too. In memory, there have been two.
可能是我生性比较冷淡，不喜欢热闹。而且，我也不胜酒力。所以，我很少有喝醉过。在记忆里，有过两次。There are only two rains in London a year: August through April, and May through July.
伦敦一年只下两次雨：八月到四月，五月到七月。Did her a Di mother send person to have never called to come over to call eldest daughter two?
她一个嫡母派人去叫了长女两次，都没叫过来？Most of us come down with at least a couple of colds a year; children get up to a dozen.
我们当中的大多数人一年至少要得两次感冒，儿童要达12次。in both hands, the piano goes over into a sprint of octave-chords and single notes, jumping manically up and down the keyboard twice a bar.
钢琴的两只手以半音阶短倚音向上，转变成八度和弦和单音符，一个小节内在键盘上狂躁地上上下下跳跃两次。Also, if you really just can't fit it in, or make yourself do it, try to go for a twenty-minute walk each day. Or two ten-minute walks.
如果你真的很难专门挤出锻炼的时间，那也没关系，试着每天散步20分钟吧，或是拆分为每天两次、每次10分钟的散步。