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

• For example FindBugs and IntelliJ both define their own annotations to indicate when a method may return null.
  比如FindBugs和IntelliJ都定义了自己的注解，以表示方法何时返回null。
• 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 marriage was declared null and void.
  婚事已宣告无效了。
• This parameter can be NULL.
  该参数可以为空。
• If the cpr attribute is true, a JavaScript variable is declared and initialized with null.
  如果cpr属性为true，就会声明一个JavaScript变量并由null对该变量进行初始化。
• 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。
• 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。
• 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。
• Note that CPU and disk values can be specified as null if checking for user activity only is desired.
  注意，如果只希望检查用户活动，则可以将CPU和磁盘值指定为空。
• 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）。