1、All comments become null and void after 7 days.
我們所有的評論在7天后全都失效。

2、This certificate shall be considered null and void in case of any attention.
此證書在任一情況下將被認(rèn)為是無效的的。

3、The award is null and void and has no binding force.
該裁決是無效的，沒有拘束力。

4、The contract was declared null and void by the competent authority.
主管部門宣布該合同無效。

null and void翻譯