返回所在国的签证必须在指定停留期后至少三个月内有效。
The visa for the return country must be valid for at least three months beyond the period of intended stay.
两次入境签证有效期一般为三至六个月，每次停留期为30天。
A double entry visa is valid for 3 to 6 months with duration of each stay 30 days.
停留期的计算，是以天为单位的，一般情况是从入境第二天开始。
Duration of stay after entry calculates by days. It usually starts to count from the second day of entry.
榴辉岩石榴石生长成分环带的保存说明超高压变质岩在峰期变质阶段有非常短暂的停留时间，并以很快的折返速率抬升到地壳浅部。
Preservation of the growth zoning of eclogitic garnets suggests that the UHP rocks have a short residence time before the retrograde metamorphism and have a very high uplift rate.
一旦它的一个碱基发生突变，就可使线虫永远停留在幼虫期，而无法成熟。
Once one of its base mutation, would enable the nematodes remaining in the larval stage, and can not mature.
她仿佛停留在美妙的青春期，越来越讨厌各种陈规，越来越不在乎别人的嫌厌和怀疑，只在自己简单的现实世界里寻求乐趣。
She was becalmed in a magnificent adolescence, more and more impenetrable to formality, more and more indifferent to malice and suspicion, happy in her own world of simple realities.
她仿佛停留在美妙的青春期，越来越讨厌各种陈规，越来越不在乎别人的嫌厌和怀疑，只在自己简单的现实世界里寻求乐趣。
She was becalmed in a magnificent adolescence, more and more impenetrable to formality, more and more indifferent to malice and suspicion, happy in her own world of simple realities.
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