Functions provide two essential benefits to the serious programmer.
函数为严肃的程序员提供了两个基本优势。
These levels aren't entirely serious. Not every programmer aspires to the same things in their career.
当然，这个级别排的不是很严肃，并且每个人对自己的职业规划都不一样。
Also, for you programmer types, note that serious fatal errors — the sorts of things that would cause exceptions to be thrown — don't appear in the use cases at all.
另外，对于程序员，请注意在用例中根本不要出现严重的致命错误——这种错误会导致抛出异常。
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