对您可能提出的疑问做一个回答：确实如此，在开始创建实际的元素之前，您的确需要三个不同的工厂。
To answer what you are probably asking: yes, you really do need three different factories before you can start creating the actual elements.
维护文档：如果在开始本步骤之前还没有开始创建文档，现在应该开始了。
Maintain documentation: If you haven't begun creating documentation prior to starting this step, it's time to start.
如果在开始本步骤之前还没有开始创建文档，现在应该开始了。
If you haven't begun creating documentation prior to starting this step, it's time to start.
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