It's an unwritten rule that you have to bring a gift to this event.

参加这次活动必须带礼物，这是不成文的规定。

These stories are unwritten in history.

这些故事都是历史上没有文字记录的。

I suggest that you put this speech in an unwritten form.

我建议你将这段演讲以非书面的形式表达出来。

Without unwritten rules civilized life would be impossible.

没有不成文的规章，就不会有文明生活。

They obey the one unwritten rule that binds them all–no talking.

他们遵守那条约束他们所有人的不成文规定—不许说话。

The photographs were to be included in his as yet unwritten autobiography.

这些照片准备要收入他那尚未写的自传。

Universal has agreed to pay $5 million for Grisham's next, as yet unwritten, novel.

环球公司已同意给格里森姆的下一部还未完稿的小说支付500万美元。

In football, as in life, the future is unwritten.

依此类推。 在足球，就像生活中的其它事情一样，事事难料，前途未卜。