null and void造句

1、All comments become null and void after 7 days.
我们所有的评论在7天后全都失效。

2、This certificate shall be considered null and void in case of any attention.
此证书在任一情况下将被认为是无效的的。

3、The award is null and void and has no binding force.
该裁决是无效的，没有拘束力。

4、The contract was declared null and void by the competent authority.
主管部门宣布该合同无效。

null and void翻译