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Sustainability isn't an option; it's a responsibility we owe to future generations.
质数就是当你把所有模式都去掉后剩下的东西。我认为质数就像生活。它们非常合乎逻辑,但你永远无法弄清楚规则,即使你花所有时间思考它们。
They throw their shadows before them who carry their lantern on their back.