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If you worried about falling off the bike, you'd never get on.
如果你担心从自行车上摔下来,你就永远不会骑上去。
最好的机会往往出现在市场低迷时期。
To live without joy is the privilege of the just.
The essence of mathematics is not to make simple things complicated, but to make complicated things simple.
真正的可持续性意味着为子孙后代留下比我们发现时更好的土地。