I try to sing a song, but in vain.
我想唱一支歌，但是唱不出来。
He try to deceive his mother but in vain.
他试着欺骗他的妈妈，但失败了。
他的一切尝试全归无效。
In vain did David try to stop the job from being done.
大卫试图阻止在进行中的工作没有结果。
If you try to keep yourself in shape, you're vain.
如果你试图保持身材，你很虚荣。
If you try to keep yourself in shape... you're vain.
如果你注重自己的身材，——你很虚荣。
If you try to keep yourself in shape... you're vain.
如果你注重自己的身材，——你很虚荣。
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