几个有用的短语

　　今天读文献时学到的几个短语，看着挺有用就把它们记下来了。

１、teeth gnashing and head scratching  咬牙切齿，挠头，形容很烦躁

例：Resolving problem like this requiring many hours of teeth gnashing and head scratching.

2、nuts and bolts  具体细节

例：In this section, we look at the real nuts and bolts of this problem.

3、One size fits all 一招吃遍天下