第二个要害性的概念是有用时间。
几个月前，我让你《不要害怕失败》，告诉你要拥抱失败——或者至少拥抱失败的可能性——对成功来说，这是必要的。
A couple of months ago, I asked you not to fear failure, saying that embracing failure - or at least the possibility of failure - was essential to success.
但Ruby哲学的另一方面是：不要害怕运行时的变化；不要害怕动态性。
Yet another aspect of the Ruby philosophy is: Do not fear change at runtime; do not fear what is dynamic.
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