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1. pop up 突然出现
After no one had heard from him for years, John popped up in town again.
大家已经很多年没有约翰的消息了，他却突然在城里出现了。
2. ferret out 查出
They are easy to ferret out and eliminate, often just by asking two or three quick questions.
这种人很容易辨别和剔除，通常问两三个简单的问题就解决了。
3. splice out 剪接
These elements are parasitic bits of DNA that have the peculiar ability to insert themselves into host genomes and to splice themselves out when expressed as RNA.
这些DNA是寄生性的遗传单位，拥有特异能力，能将自己插入宿主基因组中，并能在转译出RNA后自行剪接。
4. or so 左右
In another three weeks or so, around the time of weaning, mom will lead them on their first trip out of the den.
再过三周左右差不多就该断奶了，那时妈妈会带领它们第一次离开它们的窝。
n. 合作，通敌
