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引力比其他力弱得多这一事实可能是物理学中最深刻的谜团。
A writer is somebody for whom writing is more difficult than it is for other people.
现在如果送给别人很少的东西,却希望人家回报很多的东西,那么,人们就会怕你再送东西给自己了。 
History does not long entrust the care of freedom to the weak or the timid.