當dong1且ce2僅gan2當dong1

English

1. if and only if

Examples

• 当且仅当你知道我们的密码你才可以进来。

  You can come in if and only if you know our password.

  Tatoeba · eastasiastudent CC BY

• 当且仅当冰淇淋是香草口味，小王会吃这个冰淇淋。

  If and only if the ice-cream is vanilla flavour will Xiao Wang eat it.

  Tatoeba · eastasiastudent CC BY

• 当且仅当一个人是个没有结婚并可以结婚的男人，那个人是个未娶。

  A person is a bachelor if and only if that person is a marriageable man who has never married.

  Tatoeba · eastasiastudent CC BY