7. go back on one' s words 说话不算数

We cannot account on him. He always goes back on his words. 他那个人说话从不算数,我们可不能依靠他。

Don' t be a person who goes back to his words. No one would like to make friends with him. 你不能做说话不算数的人，没人愿意跟那样的人做朋友。

8. beat one' s gums 废话连篇

Who would enjoy sitting there listening to your beating your gums? 谁喜欢坐在那里听你的废话连篇？

He has nothing to do but to beat his gums all day. 他整天无所事事的，就知道讲废话。

9. bite the hand that feeds one 恩将仇报

Don' t you know she' s the one that would bite the hand that feeds her? 你难道不知道她是个恩将仇报的人？

He did this for you. How could bite the hand that feeds you? 他这么做全是为了你，你怎么能恩将仇报呢？

10. not have the heart to do 不忍心

If I were you, I wouldn' t have the heart to leave the kids at home uncared for. 如果我是你，我可不忍心把孩子们就在家里没人照看

Never will I have the heart to hurt you. 我永远不会忍心去伤害你。

11. an eager beaver 勤快

He' s an eager beaver, never staying idle. 他特别勤快，从来没有闲着的时候。

The boy is an eager beaver. All of us like him. 他是个勤快的小伙子，大伙儿都喜欢他。