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

• 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。
• 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。
• 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。
• 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。
• Returns NULL if the wrong passphrase or authenticator information is used.
  如果使用了错误的通行短语或验证器信息，则返回null。
• 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。
• 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。
• 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。
• 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。
• This tag determines whether or not the field in the name attribute is null.
  这个标签确定name属性中的字段是否为空。