Once a period of time的意思|示意

Nonimmigrants enter the United States for a temporary period of time, and once in the United States, are restricted to the activity or reason for which their nonimmigrant visa was issued.

非移民工人短暂的逗留美国，在美国只能被限制从事他们在签证上说明的原因上的活动。

In other case, once staff is identified they can work with the original team for a period of time to absorb knowledge about the portal.

在其他情况下，确定职员后，他们可以与初始团队工作一段时间，来熟悉有关门户的知识。

This is a few scattered pieces of the 2008 business trip to Suzhou once shot, photo reminds me abruptly that period of time past.

这几张散片是2008年有一次去苏州出差时拍的，照片让我蓦地想起了过去的那段时光。

I don't like boring subject, after a period of time, he said: "I don't know what to say..." Once I see, sighed, not hesitate to back to a sentence: "no conversation topics to seek a topic to!"

我不喜欢无聊的话题，经过一段时间，他说：“我不知道说什么……”我一看，叹口气，毫不犹豫的回了句：“没话题就找话题啊！”

Such a small PE such as this one would probably not be noticed or cause problems unless there were many of them showered into the pulmonary circulation at once or over a period of time.

这样的小栓子一般对机体的影响很小，只有众多的小栓子突然或者在一段时间内进入肺循环，才会造成严重影响，可能导致肺高血压。

There is also a tornado that appears once the fight has gone on for a certain period of time.

当战斗进行了一段时间后，一个龙卷风会出现在竞技场里。