这些名称是“订单”或“行程”之类的内容，它们使用生命周期控制其行为。
These nouns are things like "orders" or "trips" that have a life cycle controlling their behavior.
你可以仅仅的去试试运行程序，然后看看结果对不对？这就是测试的内容。
Well, you could just try it and see if it works, right? That's what testing is all about.
您永远不应立即运行一行程序；在您真正运行命令之前应该总是先打印出该命令会执行什么内容。
You should never run a one-liner outright; always print out what it will do before you actually run the command.
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