为了写出好的代码，你必须了解语言之间的细微差别。

To write good code, you must understand the language's nuances.

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在这次，你必须先用scalac来把代码编译成jvm可认的。class文件。

This time, you must first compile the code to a JVM.class file using scalac.

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代码必须改变因为你使你最后的版本。

Your code must have changed since you made your last release.

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如果你必须这样做，你小心翼翼的代码重写。

If you must do it, code your override with extreme care.

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你必须确保你的服务器端代码是安全的。

You'll have to make sure your server-side code is secure.

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你必须确保你的服务器端代码是安全的。

You'll have to make sure your server-side code is secure.

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