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

• 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。
• Data is Null. This method or property cannot be called on Null values.
  数据为空。不能对空值调用此方法或属性。
• 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。
• 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 parameter can be NULL if the previous semaphore count value is not required.
  如果并没有请求上一个信号量计数器的值，那么这个参数可以是NULL。
• Specify null to return information for all tables and views in the specified database.
  指定null可返回指定数据库中的所有表和视图的信息。
• We added the NOT NULL flag to indicate that the fields must not be null.
  我们添加了NOTNULL标志来指示字段必须不能为空。
• 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。
• 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。
• 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。