他们支持召开首脑会议，不管这种会议有无成就。

社会一旦有技术上的需要，则这种需要就会比10所大学更能把科学推向前进。

以其人之道，还治其人之身。

有的游客也许会想到自己是有身份的人，而在美国所受到的待遇却跟普通人一样，因此觉得自己被怠慢了。

Emergency measures must be taken to eliminate the air pollution of a city, which, as reported by the control center, exceeds tolerance limits and endangers the safety of the inhabitants. (译成条件状语从句)

I'll try every possible effort to get an illustrated dictionary with technical glossary, which will enable me to translate scientific literature more exactly.(译成目的状语从句)

留得青山在，不怕没柴烧。

一有问题就去解决，不要等问题成了堆才去作一次总解决。

But he did not talk at length about the matter, which was not considered by the White House to be a particularly important question. (译成原因状语从句)

Late last century all the universities in the United States adopted the credit system which benefited student a great deal. (译成结果状语从句)

She lived her life apart from the workers on whose skill she depended.(译成让步状语从句)