I’m morally under obligation to do the best I can by her.

在道义上有责任尽量善待她。

"What you did wasn't actually against the law, but it was morally wrong."

"你所做的事并未真正触法,但在道义上是错误的。"

I felt morally obliged to do the best I could for her.

道义上感觉必须尽所能为她效劳。

Tom refused to join the army, believing that he had no moral right to kill.

汤认为自己在道义上无权杀人而拒绝入伍。

He deceived us into believing that he could give us moral support.

他骗得相信他能道义上的支持。

Your action contrast with your principles.

你的行为和道义对比时就显示出差别。