英语习语：

turn one's back (在别人遇到困难时)不愿帮助

——He'll turn his back on me if I ask for money. (我若向他借钱，他就会不理我。)


双语例句：
He will turn his back on me if I ask him for money, even if other people think we are good friends!
尽管别人以为我们俩是好朋友，但如果我向他借钱，他肯定会拒绝我的。

I won't ever forgive my older brother--he turned his back on me and refused to lend me any money when I lost my job.
我永远也不会原谅我的大哥哥。当我失去我的工作的时候，他根本不肯帮忙，一点钱都不愿意借给我。

My father deserted my mother and me when I was five years old. But I can't turn my back on him now that he's old and sick. So I'm paying the rent for him on a little apartment in Los Angeles.
当我五岁的时候，我爸爸抛弃了我妈妈和我。可是，现在我爸爸又老又病，我可不能不管。他现在在洛杉矶租了一个小公寓套房，我替他付房租。