海蒂不断地与悲伤作斗争，但白费力气。
您是白费力气，傻医生！
汤姆叹了口气说：“好啦，好人，别再白费力气了，你的魔力已经跑掉了。”
Tom sighed, and said, "There, good soul, trouble thyself no further, thy power is departed out of thee."
没人会听借口，所以不要白费力气。
我说服他戒烟，但却白费力气。
I tryed very hard to persuade him to quit smoking, but to no purpose.
你恳求那种人将是白费力气。 。
他白费力气想抓住停在花上的蝴蝶。
但是最后结果表明我们白费力气了。
Final results showed that we beat our head against the wall.
这就是一个白费力气的努力。
所以你去告诉仲天骏，不要白费力气。
你恳求那种人将是白费力气。
你可以问他，但我觉得你是在白费力气。
You could ask him, but I think you are just spinning your wheels.
我们试图使他改变他的主意，但白费力气。
过去的事哭也是白费力气。
我不想你明天又白费力气。
你觉得你能改变结果，你只是在白费力气。
向爱斯基摩人推销电冰箱简直是白费力气。
Selling refrigerators to the Eskimos is like carrying coals to Newcastle.
不要白费力气去帮他。
一旦你的愤怒被激起，问你什么问题都是白费力气。
It does not help asking the question once your anger has been aroused.
从民调结果来看，这些做法很可能只是白费力气。
如果你能弄到我要的钥匙，我不会让你白费力气。
If you can get me the key I want, I'll make it worth your while.
教廷的队长曾白费力气地试图说服妻子留下不去。
The papal captain have vainly endeavoured to induce his wife to remain behind him.
好消息是，你不需要在对你不重要的结果上白费力气了。
The good news is that you need not spend energy for results that don't matter to you.
应该要有挑战，但是也不要太挑战了以至于失败和白费力气。
It should be a challenge for sure, but not so challenging that you are lost and spinning your wheels.
每次你想要一起放一个营销计划时你不必白费力气做同样的事。
You don't have to reinvent the wheel every time you want to put a marketing plan together.
甚至列出一个庞大的任务清单也是不可取的——你只是在白费力气。
And it's not even desirable to do a huge task list - you're just spinning your wheels.
甚至列出一个庞大的任务清单也是不可取的——你只是在白费力气。
And it's not even desirable to do a huge task list - you're just spinning your wheels.
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