Their complaints are well-founded.
他们的抱怨是有理由的。
he is justifiably bitter.
他的怨恨是有理由的。
In the young there is a justification for this feeling.
在年轻人中有这种感觉是有理由的。
He had a legitimate reason for being late.
他迟到有合理的理由。
The wolf finds reason for taking the lamb .
叼羊的狼总有理由。
You have given him cause for anger
你使他有发火的理由。
She gave no reason for her absence
她没有说缺席的理由。
Both sides have some justice in their claims.
双方的要求都有些理由。
I have no reason to quarrel with him.
我没有跟他口角的理由。
unwarrantable criticism.
没有充分理由的批评
He has good reason to refuse.
他有充分的理由拒绝。
There were strong reasons for this.
这样做是有充分理由的。
owe a person a grudge
(有正当的理由) 怀恨某人
There are three reasons against it : First...
有三个反对的理由： 第一…
You have no grounds for complaint/for complaining.
你没有抱怨的理由.
There is no real reason for complaint.
没有什么可抱怨的理由。
in an uncalled-for manner.
以没有正当理由的方式。
To have a cause for complaint
有提出抗议的正当理由