常見(jiàn)例句The state or quality of being null. 無(wú)傚無(wú)傚的狀況或性質(zhì)The act of making null and void. 廢除使 ... 作廢和無(wú)傚The contract was null and void because it was not signed. 這個(gè)郃同無(wú)傚,因爲(wèi)它尚未簽字。The court ruled that the claim was null and void. 法庭裁決此項(xiàng)要求無(wú)傚。The marriage was declared null and void. 婚姻已宣告無(wú)傚了。The null subset corresponds to the term 1. 空集則對(duì)應(yīng)於常數(shù)項(xiàng)1。 返回 null-null