A spokeswoman said the agreement had been declared null and void.

一位女发言人说那个协议已被宣布为无效的。

The contract was declared null and void.

合同被宣布无效。

The marriage was declared null and void.

婚姻已宣告无效了。

All comments become null and void after 7 days.

我们所有的评论在7天后全都失效。

The agreement will be considered null and void.

该项协议将被视为无效。