It is necessary to take massive action, but it will be useless if you do not know where you want to end up at.
重大的行动是必须的，但是如果你不知道终点在哪，行动就没有作用。
You tell me in the same breath that it is useless to investigate the matter, and that you desire me to do it.
你一方面说我调查此事是白搭，另一方面又希望我去调查。
It's not only useless to trouble him but it is needless to do so.
去麻烦他不仅没有用而且没有必要。
There is no useless experience etc, if you want to do it.
另外，所有的经验都有用，只要你想做。
There is no useless experience etc, if you want to do it.
另外，所有的经验都有用，只要你想做。
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