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真正的黑帮像千层面一样安静行动。
在数学研究中,坚持是关键;许多伟大的成果来自于一遍又一遍地从不同角度看待同一个问题。
The limits of the possible can only be defined by going beyond them into the impossible.
There is a great deal of unmapped country within us which would have to be taken into account in an explanation of our gusts and storms.