I have done is in vain, and I never like this.
all their efforts will be in vain.
All of the efforts have been wasted
All their efforts will be in vain.
对应的英语：in vain.例如：All of his efforts were in vain.
What I do for you is worthless, I won't do it any more.个人见解
All of their efforts will be in vain.
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叶丽美11
