All this has been demonstrated in elaborate experiments.

所有这些都在精心设计的实验中得到了证明。

youdao

When all of this has been collected, it is possible to make a training specification.

当所有这些都被收集之后，就可以制定一个培训规范了。

youdao

A more radical solution is to find new sources of commercial revenue within the terminal, and this has been explored by many airports over the last decade or so.

一个更激进的解决方案是在航站楼内寻找新的商业收入来源，而在过去十年左右的时间里，许多机场都在这一方面进行了探索。

youdao

This has been the second part of the story "A Princess of Mars" by Edgar Rice Burrows.

VOA: special.2010.07.17

Until the next time, my name Paul Raushenbush is Paul Raushenbush and this has been the Inner Core.

感谢您收看我们的节目,人性讲堂，我是主持人。

普林斯顿公开课 - 人性课程节选

because it will give you an opportunity to say "I want to be sure that this is done, has been done"

因为用这个句型，你就能表达“我想确认这事会做到的，或者已经做到了。”

Make sure 课堂 - SpeakingMax英语口语达人

"This has been a difficult and challenging few days, " said U.S. military spokesman Maj.

NPR: Clashes with Militants Test Iraqi Security Forces

This has been a trouble spot, is that right, in the Sunni triangle for some time?

NPR: U.S. Envoy Describes Troop Withdrawal

"This has been a rule in the United States Senate since 1884, " Durbin said.

CNN: Democrat: Blagojevich 'called our bluff' on Senate pick