They are small enough to easily slip inside your house, live in colonies that number in the tens of thousands to the hundreds of thousands, and reproduce quickly.

它们很小，可以轻易地溜进你的房子里，成群地生活，数量从几万到几十万，迅速繁殖。

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You may feel tired enough to fall asleep anywhere, but sleep researchers find that these controllable factors play a huge role in how easily and quickly people can fall asleep.

也许你累到哪里都能入睡，但睡眠研究人员发觉这些可控因素很大程度决定你是否可以轻松快速入睡。

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Wild elephants, however, can be trapped fairly easily, and they quickly become tame enough to obey their trainer's commands.

然而，比较容易猎获野象，而且它们很快就会便得温驯，听从训象师的命令。

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What's needed is to end illegal immigration by creating ways for needed workers to come legally -- creating worker visas and establishing a system that allows employers who can't find enough willing and able Americans to connect easily and quickly with lawful immigrants.

CNN: Key to immigration reform: Worker visas