null

英 [nʌl]

美 [nʌl]

adj.  零值的; 等于零的

现在分词：nulling　过去分词：nulled　过去式：nulled　复数：nulls　第三人称单数：nulls　

TOEFLIELTS计算机

BNC.12712 / COCA.15008

习惯用语

adj.

null and void
• 无法律效力的；无效的
  having no legal force; not valid
• The contract was declared null and void.
  合同被宣布无效。

牛津词典

adj.

• 零值的；等于零的
  having the value zero
  1. a null result
     毫无结果

柯林斯词典

• PHRASE (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 isnull and void, it is not legally valid.
  1. A spokeswoman said the agreement had been declared null and void...
     女发言人称该协议已宣布无效。
  2. 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。

英英释义

noun

• a quantity of no importance
  1. it looked like nothing I had ever seen before
  2. reduced to nil all the work we had done
  3. we racked up a pathetic goose egg
  4. it was all for naught
  5. I didn't hear zilch about it
  Synonym:nothingnilnixnadaaughtciphercyphergoose eggnaughtzerozilchzipzippo

adj

• lacking any legal or binding force
  1. null and void
  Synonym:void

双语例句

• Null value is not allowed in unique index or primary key.
  唯一性索引或主键中不允许有空值。
• NULL values in a column can be replaced by user-defined text using the NULL TEXT option.
  可以使用NULLTEXT选项将一个列中的NULL值替换为用户定义的文本。
• If this is null, the semaphore cannot be inherited.
  如果这个指针为空，那么这个信号量就不能被继承。
• Objectify also provides a find method, which instead returns null.
  Objectify还提供一个find方法，而该方法返回null。
• The fifth parameter to which we pass null in this example accepts an image instance.
  第五个参数（在本例中我们将null传递给它）接受一个图像实例。
• The marriage was declared null and void.
  婚事已宣告无效了。
• A spokeswoman said the agreement had been declared null and void
  女发言人称该协议已宣布无效。
• If the lua_open() call fails, it returns a null pointer.
  如果luaopen（）调用失败，则返回一个null指针。
• The agreement will be considered null and void.
  该协议将被视作无效。
• If null values are supplied, an error ( exception) will occur.
  如果提供了null值，将出现一个错误（异常）。