翻译
  • 简明词典
  • 柯林斯词典
  • AI释义
  • AI解词
  • 牛津词典
  • 当且仅当

    • [dāng qiě jǐn dāng]

    释义

    • if and only if  
      当且仅当;
    • when and only when  
      当且仅当;
    • iff  
      if and only if 当且仅当…时,在而且只有在…时;
  • 实用场景例句

    • 全部
    • iff

    An edge is a bridge if it is not contained in a cycle.

    一条边是桥当且仅当它不包含在圈中.

    辞典例句

    Positive semi - definite matrices are positive definite if and only if they are nonsingular.

    正半定矩阵是正定的,当且仅当它们是非奇异矩阵.

    辞典例句

    Arrays are assignment - compatible only if they are of the same type - the following code will not compile.

    数组之间是赋值兼容的当且仅当它们属于相同的类型.

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    This predicate returns true iff u has extended a friendship invitation to v.

    该谓词返回true当且仅当u向v发出了朋友邀请.

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    Also, a hyperplane in X is Tsequentially closed iff it is T ~ - - closed.

    又, X中超平面为T—列闭当且仅当它为T~ -— 闭.

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  • 词组搭配

    当且仅当操作

    if and only if operation

    当且仅当运算

    if and only if operation

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  • 行业词典

    • 数学

      if and only if   又称 :当且仅当(iff )