释义：

Having suitable skill in multiple things, but not being an expert in any of them.了解很多事情，但是没有一件是擅长的；

来源：

The word &`&jack&`& can refer to the common man. Jack指一个人。Thus, a &`&jack of all trades&`& meant a man who is competant at many different skills. Jack of all trades指的是一个错才多艺的人。The first half of the phrase was being used in the 1600s, 这个词组的第一部分刚开始是在16世纪使用的，and was apparently spoken in a complimentary fashion when describing people. 是用来赞扬某人。

An early example comes from a book published in 1612, titled Essays and characters of a Prison and Prisoners. 这个词组比较早的来源是1612年标题是Essays and characters of a Prison and Prisoners 的书中。

From what I could find, it looks like it was somewhere around the 1800s when the expression developed a less praiseful meaning, as that was when the &`&master of none&`& part was attached to it. 慢慢地从18世纪开始，随着master of none的加入，这个词组的意思就慢慢不再表示夸奖了。

举例：

1.He seems to know almost everything, no wonder he is referred to as a jack-of-all-trades and master of none.

他似乎对所有的事情都知晓，难怪人们称他为万事通，但其实他样样不精。

2. I was planning on earning an associate&`&s degree in numerous subjects, but my family suggested not to be jack of all trades and master of none, so I had to rethink my future plans with college.

我准备去拿许多科目的副学士学位，可是我家人建议我不要变得万事皆通，但一无所长的人，所以我准备重新思考下大学的学习计划。