1·Menstruation (a period) is a major stage of puberty in girls; it's one of the many physical signs that a girl is turning into a woman.
月经（例假）的来到是女孩青春期中经历的一个重要阶段；它是女孩变为女人的众多生理变化之一。
2·However, China will remain in an under-developed stage for a long period of time. There are still many difficulties and challenges ahead of us.
同时，中国处于并将长期处于不发达的阶段，在前进的道路上仍有许多困难和挑战。
3·At a certain stage during your period of solitude, the answers to the most pressing difficulties facing you will emerge quietly and clearly, like a boat putting in gently to the side of a lake.
在孤独的特定时期，你所面临的最大困难的解答会静静地清晰地显示在你的脑海中，像湖面上轻轻飘浮的小船。
4·The story focuses on the efforts of a director to stage a musical during what period in us history?
那么这个故事集中讲述的是在美国历史上的哪个时期，一个导演为筹备音乐剧所做的努力呢？
5·In a short period, we've seen science at work on a very public stage.
短期内，我们看见科学在非常公开的舞台上运作着。
6·The next stage of the import wizard is to specify the time period from which to import data (Figure 16).
导入向导的下一个阶段是指定导入数据所开始的时间段(图16)。
7·It turns out that Shakespeare was the only dramatist of the period to stage scenes in these counties.
好像当时可以在这些乡郡搬台演戏的剧作家，仅仅只有莎翁一个人。
8·You start off with a transition period when you're falling asleep. We call that stage I.
一开始是过渡期，你开始进入睡眠状态，这是第一阶段。
9·That stage was reached in China some time between 1990 and 2005, during which period the middle-class share of the population soared from 15% to 62%.
这段时期在中国是1990年至2005年，期间中产阶级的人口份额从15%飙升至62%。
10·During the stage of developing digital controller, the period of development study can be shortened with the system.
在数字式控制器的开发阶段，利用该测试系统可以有效地缩短控制器的研发周期。