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

• 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。
• 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。
• 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。
• 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。
• At least one element in the specified array was null.
  指定数组中至少有一个元素为空。
• 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。
• 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。
• 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 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。
• 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。