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引力波的探测为我们打开了一扇观察宇宙的新窗口。
记忆是我们以为已经忘记的东西;它是我们已经忘记自己忘记了的东西。
The propensity to truck, barter, and exchange one thing for another is common to all men, and to be found in no other race of animals.