throw a long line to catch big fish 本来就是一个俚语
不要以为老外所有的想法都很另类 和中文意思一样的也有
比如 I was not born yesterday ---我又不是小孩,别骗我了
she’ll be all right--- 她一切都会好起来
放长线钓大鱼:
Throwing a long line out a big fish
Catch a big fish , one must cast a long line
Long line to catch a big fish
Throw a long line to catch a Big fish.
放长线,钓大鱼。
To catch a Big fish,one must cast a long line.
skilled in the ways of the long con