1.back and forth 来来回回

She rocks back and forth on her chair like a mischievous child.

她在椅子上来回晃动，像个调皮的孩子-i20hR*HNC+e。

2.give in 让步

He refused to give in to bullying and threats.

他拒不向恐吓威逼势力让步#Xcar]v7Pg&Is58*n。

3.failed by 被……辜负

My children have been failed by me, I should have spent more time with them.

我没能多陪陪我的孩子，我辜负了他们!Gp[Y;YlLgeZ+。

4.stand by 支持

I wouldn't break the law for a friend, but I would stand by her if she did.

我不会为朋友违法，但如果她犯了法我还是会继续支持她D69%|E]MUYb4@j[6HSM&。