consciences
Your conscience is the part of your mind that tells you whether what you are doing is right or wrong. If you have a guilty conscience, you feel guilty about something because you know it was wrong. If you have a clear conscience, you do not feel guilty because you know you have done nothing wrong.
I have battled with my conscience over whether I should actually send this letter.
我曾跟自己的良知斗争应否真的寄出这封信。
What if he got a guilty conscience and brought it back?
如果他问心有愧,又把它带回来了呢?
Conscience is doing what you believe is right even though it might be unpopular, difficult, or dangerous.
He refused for reasons of conscience to eat meat.
他处于良知而拒绝了吃肉。
Conscience is a feeling of guilt because you know you have done something that is wrong.
I'm so glad he had a pang of conscience.
我很高兴他感到了一阵愧疚。
on your conscience
If you have something on your conscience, you feel guilty because you know you have done something wrong.
The drunk driver has two deaths on his conscience.
这位酒驾司机背负着两条人命,良心上受到了谴责。