重点讲解：
1. in the least
丝毫；一点儿；
eg. I'm not in the least bit touched by the Marilyn Monroe kind of beauty.
我对玛丽莲·梦露那种美一点儿都不动心。
eg. I don't think you need to worry in the least.
我看你一点也不用着急。
2. pose a threat to
对……构成威胁；
eg. This could pose a threat to jobs in the coal industry.
这可能会给煤炭产业的就业造成威胁。
eg. Uranium occurs naturally throughout the world, but is normally only present in low background levels which pose no threat to human health.
天然铀广泛分布在自然界中，但正常情况下其环境背景值很低，对人体健康无害。
3. return to
返回，回到；
eg. At the end of my term of enlistment I decided to return to civilian life.
在我退役的时候，我决定复员过平民生活。
eg. Once most wires are bent out of shape, they don't return to the original position.
大多数金属丝一旦弯曲变形就无法恢复原状。