要么该属性不应该存在(根据我的习惯)，要么它必须有一个值。

Either that attribute should not exist (my preference), or it must have a value.

youdao

语言不是孤立存在的，它必须与一定的语境相结合。

Language is not in isolation. It must be a combination of Context.

youdao

为此必须考虑其解的存在性，即讨论它的解是否具有稳定性。

Therefore, we need the steady state solution in the computation.

youdao

爱不能单独存在，它的本身并无意义。爱必须付诸行动，而行动就是服务。

Love has to be put into action and that action is service.

youdao

爱不能单独存在，它的本身并无意义。爱必须付诸行动，而行动就是服务。

Love has to be put into action and that action is service.

youdao