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告别昨日是如此艰难
It's so hard to say goodbye to yesterday
 整个言语行为包括发声的行为和表达意义的行为。
变革的速度要求敏捷性——无论是思维还是行动。
Inflation is a very bold idea, but it seems to be the only way to explain the observed features of the universe.
True leadership inspires others to achieve more than they thought possible.
要养活世界,我们必须首先了解脚下的土壤。