“以前我们摸着石头过河，现在是乘着大船出海。”陈明峰说。课堂上，陈老师与名校教师互相配合，一个负责主讲，一个负责面授辅导。
any of those things.
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But also why it’s not that hard
CMU COLOR Instances
The key property of an abstraction is to hide certain implementation details so people can work with them using a standard interface (that of the abstraction).