《白费心机》是简宁作词， K Hairston、T Gale作曲，关淑怡演唱的歌曲，该歌曲收录在关淑怡1991年发行的专辑《恋一世的爱》中。
我们想使他改变主意，结果是白费心机。
查理斯向哥哥请教数学。但他是白费心机了，他哥哥的数学一点也不好。
Charles asked his brother to teach him math. but he is barking up the wrong tree. His brother isn't good at math at all.
警方在远离劫案发生地近50英里的地方开始调查，恐怕他们是在白费心机。
I'm afraid the police are barking up the wrong tree by starting their investigation nearly 50 miles from where the robbery happened.
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