保持简单地说：“嗨、喂或你好”——尽你所能地集中所有的热情和精力，笑容满面地说“嗨”。

Keep it simple: "Hi", "Hey" or "Hello"—do the best you can to gather all of the enthusiasm and energy you can, put on a big smile and say "Hi".

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因此，努力让界面保持简单。

So, try to keep it simple.

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保持简单的继承层次结构。

Keep your inheritance hierarchy simple.

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