Question

null adj.无效的；无价值的；无效力的n.零；空vt.使无效 (1) 婚姻已宣告无效了。(2) 该路经必须以零结尾。(3) 如果在零重力下呕吐了可不是件好笑的事。(4) 向占位程序传送了空的索引指针。(5) 主键不允许空值。 From the Latin nullus, meaning "not any," poor, powerless null is not actually there at all. Or if it was, it’s gone now. Because null is basically nothing, zip, zilch, nada, and nix. What could be worse? Maybe being "null and void," which is a legal term making something really, really null. Null is the base of the word nullify, which means to make something invalid or to cancel something out.

Accepted Answer

英 [nʌl] 美 [nʌl] (1) The marriage was declared null and void.(2) The path must end with a null character.(3) Vomit in null gravity wouldn't be fun.(4) A null reference pointer was passed to the stub.(5) Primary keys do not allow null values. Null means having no value; in other words null is zero, like if you put so little sugar in your coffee that it’s practically null. Null also means invalid, or having no binding force. 1[PHRASE 短语](协议、宣言或选举结果)无法律效力的，无效的 If an agreement, a declaration, or the result of an election is null and void, it is not legally valid.   [PHR after v]A spokeswoman said the agreement had been declared null and void...女发言人称该协议已宣布无效。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。

英语单词	null
英美音标	英 [nʌl] 美 [nʌl]
中文释义	adj.无效的；无价值的；无效力的 n.零；空 vt.使无效
英语例句	(1) The marriage was declared null and void. (2) The path must end with a null character. (3) Vomit in null gravity wouldn't be fun. (4) A null reference pointer was passed to the stub. (5) Primary keys do not allow null values.
中文例句	(1) 婚姻已宣告无效了。 (2) 该路经必须以零结尾。 (3) 如果在零重力下呕吐了可不是件好笑的事。 (4) 向占位程序传送了空的索引指针。 (5) 主键不允许空值。
vocabulary简明	Null means having no value; in other words null is zero, like if you put so little sugar in your coffee that it’s practically null. Null also means invalid, or having no binding force.
vocabulary扩展	From the Latin nullus, meaning "not any," poor, powerless null is not actually there at all. Or if it was, it’s gone now. Because null is basically nothing, zip, zilch, nada, and nix. What could be worse? Maybe being "null and void," which is a legal term making something really, really null. Null is the base of the word nullify, which means to make something invalid or to cancel something out.
柯林斯解释	1 [PHRASE 短语](协议、宣言或选举结果)无法律效力的，无效的 If an agreement, a declaration, or the result of an election is null and void, it is not legally valid. [PHR after v] A spokeswoman said the agreement had been declared null and void... 女发言人称该协议已宣布无效。 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。

Null Means Declared It’s Void 英 Nʌl] 美 Nʌl