null and void的用法和樣例：
例句
- The marriage was declared null and void.
婚姻已宣告無效了。 - An agreement signed by a child is void.
由兒童簽署的協議是無效的。 - We will void the existing and issue a new one.
我們將把現有的作廢，然後再出一張新的。 - There notes we designed during World War II to be easily declared void if captured in large numbers by the enemy.
這些鈔票是在二次大戰中設計的，為的是如果被敵方大量繳獲，就可能輕而易舉地宣布作廢。
