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变化的速度如此之快,以至于我们必须跑得更快才能保持在原地。
The greatest rewards come from working the hardest and not giving up.
如果经济学家能够使自己被认为是谦逊的,能干的,与牙医水平相当的人,这是好的。
To understand the meaning of a sentence, we must consider the speaker's intention and the context of the utterance.