他开会迟到有个正当的理由。

He had a ___valid excuse for being late to the meeting.

她在辩论中提出了一个非常有力的论点。

She presented a very ___valid argument during the debate.

我的想法可能和你的不同，但它们同样有道理。

My ideas might be different from yours, but they're equally ___valid.