As a branch of the post-tensioned prestressing system, external prestressing technique has become a hotspot of prestressing techniques in recent years.

体外预应力技术作为后张预应力体系的重要分支之一，近年来成为预应力技术的热点。

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The performance of the system depends on various factors including configuration of the system, external factors and current state of the system.

系统的性能取决于很多因素，这些因素包括系统的配置，外部条件以及系统的当前状态。

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"The brain-machine interface is a system that allows disabled people, people suffering from physical disabilities to communicate with external world and also to control devices."

VOA: special.2011.04.04

Here there's an expansion going on, so the system is doing work to the external world.

这里发生了膨胀,所以系统对外界做功，活塞被推出来。

麻省理工公开课 - 热力学与动力学课程节选

I mean maybe up the street we whisper, but here we know it. And, so here is a different kind of system where we have a constant external pressure.

或许在街上你们低声细语，但在这里不应该这样，这是另一个系统,我们有一个恒定的外压强。

麻省理工公开课 - 热力学与动力学课程节选

Beijing strictly controls cross-border capital movements as part of its effort to preserve savings at home and protect its banking system from external shocks.

WSJ: Chongqing Court Convicts 18 of Running $10 Billion Money-Smuggling Ring in China

It ultimately sets up an external system based only on penalties and rewards.

FORBES: Are You a Leader or Just Bossy?

Although President Obama spent much of his first year in office trying to revolutionize the U.S. health care system, the external world often inconveniently intruded.

CENTERFORSECURITYPOLICY: Little to celebrate