只有不可撤回的改变值才能观察到真正的量子位。

Real quantum bits can't be observed without irrevocably altering their values.

youdao

公司的股东可以放弃其先买权。这一弃权必须是通过书面形式来证明，而且在事后不可撤回，即使没有对价。

A shareholder may waive his preemptive right. A waiver evidenced by a writing is irrevocable even though it is not supported by consideration.

youdao

如果有提述接纳或拒绝接纳要约的不可撤回承诺，必须清楚说明是否在某些情况下（例如出现较高价值的要约），该等承诺将失去约束力。

References to irrevocable commitments to accept or reject an offer must make it clear if there are circumstances in which they cease to be binding, for example, if a higher offer is made.

youdao