have/get sth down to a science是什么意思

词组	have/get sth down to a science
释义	●have/get sth down to a ˈscience (especially NAmE, often humorous) have a very precise and efficient way of doing sth, especially sth that is normally done in a casual or informal way 以非常精确有效的方法做某事◆When Tom says he has shopping down to a science, he isn’t kidding. 汤姆说他对购物很有一套，他可不是说着玩的。

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