how long is a piece of string?
成語所屬單字long
how long is a piece of string? — 慣用語
1. Used to say that there is no definite answer to a question.
1.慣用語
釋義
沒有確切答案
Used to say that there is no definite answer to a question.
例句
When asked how long the project would take, he replied, 'How long is a piece of string?'
How long is a piece of string? It depends on many factors.