Collier argues that these countries have fallen into one, or more, of four traps from which it is virtually impossible to escape.

柯里尔认为，这些国家陷入了四个几乎无法逃脱的陷阱中的一个或者几个。

youdao

If hydrogen were used as a crack detector (it is not because of the fire hazard), it would escape four times faster.

如果把氢用来作裂缝检查(人们不这么做并是因为它们有火灾隐患)，他们逃逸的速度会比氦快四倍。

youdao

Its event horizon--theboundary at which nothing, not even light, can escape the monster’s gravitationalpull--is four times as large as the orbit of Neptune,our sun’s outermost planetary satellite.

在它的事件视界，即其边界，没有任何东西可以逃脱这头巨兽的引力，甚至连光也不行。 其引力相当于位于我们太阳系最外层行星轨道的海王星的四倍。

youdao

If hydrogen were used as a crack detector (it is not because of the fire hazard), it would escape four times faster.

ECONOMIST: Tech.view

In a test search, GetGoing recommended a four-night escape to San Jose, Costa Rica as the most compelling destination with the most affordable flights.

BBC: Flip a coin, book a flight

Anti-terrorism experts told BBC News Online that they were surprised at the ease with which three of the four attackers were able to escape from the Oasis compound in Khobar, despite the overwhelming numerical superiority of the security forces and the tactical and logistical advantages which they enjoyed.

BBC: NEWS | Middle East | Analysis: Saudi security questions