为了得到苗条的身材，范妮尝试了许多方法，但都是徒劳的。所以现在她晚饭什么也不吃了。
To get a slim figure, Fanny has tried many ways, but in vain. So now she is reduced to not eating anything for supper.
他深知与女巫斗争是徒劳无益的，所以他灰心丧气地放弃了。
He well knew the futility of trying to contend against witches, so he gave up discouraged.
所以我开始在网上查找，也是徒劳无功。
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