null 核心詞議：
adj. <術>零值的;等于零的;（協議） 無法律效力;失效的;
null 基本解釋
adj. <術>零值的；等于零的；（協議） 無法律效力；失效的
速記方法知識擴展
習語積累
習語 adj. null and void (law 律) (of an election, agreement, etc. 選舉、協議等) 無法律效力的；無效的 having no legal force; not valid The contract was declared null and void. 合同被宣布無效。
詞根詞綴
詞根 null= none 沒有, 無 annul v. 取消 an 加強 + nul〔= null〕沒有，無 → 變沒有 → 取消 null adj. 無效的；等于零的 nullification n. 無效；廢棄 null 沒有，無 + ification 形成… → 無效；廢棄 nullify v. 取消；廢除 null 沒有，無 + ify 使… → 取消；廢除
null 記憶方法
中文詞源：
null
精選例句
1、 The marriage was declared null and void.
婚姻已宣告無效了。
2、 Their actions rendered the contract null and void.
他們的行為使合同無效。
常見考點例句：
- What would be the null hypothesis , the kind of conjecture that you 'd make assuming nothing further .
- 什么是無效假設？那種你以為沒什么可深究的臆測。
- So henry called a council with the pope where he claimed that catherine had boned his older ( subsequently deceased ) brother arthur before she married henry , and thus their current marriage was null and void .
- 亨利召集有主教參加的議會，聲稱凱瑟琳在嫁給他之前已經和他的兄長阿瑟（已亡故）睡過了，這樣他們的婚姻就無效了。
- But gay rights advocates say it is important to gather backers for statements , resolutions and other documents such as the one that will be presented tuesday by the united states , even when their legal effect is null .
- 但是同性戀權利倡導者表示為這些聲明、決議和其他文件諸如周二將由美國提出的那份聲明取得更多的支持者很重要，盡管它們的法律效力是無效的。
- Just ahead of a deadline for companies to submit their plans for compliance , the movement for democratic change , the former opposition party that is locked in an unhappy national unity government with mr mugabe 's lot , said that the cabinet had pronounced the regulations " null and void " .
- 就在提出要求公司提供股權變更方案的期限之前，民主變革運動---以極不情愿的姿態與穆加貝先生組成民族統一政府的前反對黨---聲稱內閣已經宣布該法案在法律上的無效性。