◆null and void
+ declaration, agreement无效的；不具法律效力的
The declaration was null and void as it was proclaimed in completely illegal circumstances.该声明无效, 因为它是在完全非法的情况下宣布的。
to be declared null and void
agreement, contract, results +被宣布无效
A Chinese spokeswoman said the agreement had been declared null and void.中国外交部的女发言人称该协议已宣布无效。