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

我在上有责任尽她。

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

"你所做的事并未真正触犯法律,但在上是错误的。"

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

上我感觉必须尽我所能为她效劳。

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.

他骗得我们相信他能给我们上的支持。

Your action contrast with your principles.

你的行为和比时就显示出差别。