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.

他提供了一个合理的迟到借口。

He provided a ___valid excuse for being late.

你很难认为Quimper医生有罪，因为Crackenthorpe家族的每个人都有合理的杀人理由。

You could hardly think of Dr Quimper as guilty, because every one of the Crackenthorpe family had a ___valid reason to kill.