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

• This method has one parameter that you can set to null or a number of other values.
  这个方法有一个参数，可以把它设置为null或许多其他值。
• 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。
• Bernie: I told him I had null to do with this operation.
  伯尼：我告诉过他了，我和这桩生意没关系。
• The self-calibration scheme can also be extended to null system offset and gain errors in the input channel.
  自动校准方案也可以被扩展用来校准系统零点偏置和输入通道中的增益误差。
• 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。
• 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 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。
• Because the URLs returned by the default implementation of ClassLoader are null, which broke the callers code.
  因为ClassLoader的默认实现返回的URL是null，这个结果破坏了调用程序的代码。
• If this argument is null, then updatable cursors are used to modify the selected columns.
  如果该参数为null，则使用可更新的游标来修改所选的列。
• This function returns a pointer to the value in the environment or NULL if there is no match.
  这个函数会返回一个指向环境中的值的指针，或者如果不匹配则返回NULL。