相反，要使用一些对于客户来说有意义的扩展名。
Instead, use an extension that is meaningful to the customer.
或许是因为它的没有任何扩展，或只是没有意义呢？
Maybe because it's without any extensions, or it just doesn't make sense?
它意义创建一个对象的类扩展服务吗？
Makes it sense to create an object of a class which extends Service?
它意义创建一个对象的类扩展服务吗？
Makes it sense to create an object of a class which extends Service?
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