我已经绞尽脑汁了，但是还没给那个问题找到任何答案。
I've racked my brains, but I have not yet to come up with any solution to the problem.
我已经绞尽脑汁了，还是想不起来我们到底是走着去的还是做的公车还是打的车。
I've racked my brain but I don't know if we walked there, or got a bus or a cab.
我花了整个周末的时间绞尽脑汁想弄明白这些代数题，可是到现在为止我还没法肯定我已经懂。请你帮帮我吧。
Please, could you help me on these algebra problems? I've been beating my brains out all weekend trying to figure them out, but I'm still not sure I understand them.
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