他们粗略整理了一半自2004年以来被NASA雨燕人造卫星所探测到的爆炸。

They make up roughly half of the burstsdetected by NASA's Swift satellite since its 2004 launch.

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一些研究表明，有将近一半的入侵是由组织内部的雇员或者承包人造成的(或涉及到他们)。

Several studies have indicated that perhaps as many as half of all break-ins are caused by or involve employees or contractors within an organization.

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人造机器把鸟锯成两半，这种观点激发了人类的本能反应；而捕食者口中含着的猎物这一观点，我们会视之为自然的本性。

“The idea of a man-made machine chopping a bird in half creates a visceral reaction, ” he said, “while the idea of a predator with its prey in its mouth — well we’ve seen that on the Nature Channel.

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