Where the custom is "reasonable" the parties are bound by it whether they know of it or not.

只要习惯是合理的，当事人双方就应当受其约束而不管他们是否知道这一习惯。

youdao

Where the custom is "reasonable" the parties are bound by it whether they know of it or not.

只要习惯是合理的，当事人双方就应当受其约束而不管他们是否知道这一习惯。

youdao