Recall that a plug-in author needs three things: a place to put the implementation, a way to expose the DSL (the class methods), and a way to expose the instance methods for the state machine.
回顾一下插件制作者需要的三个条件：放置实现的位置，公开DSL(类方法)的方法以及为状态机公开实例方法的方法。
The elements can be put together in various ways. For example, a lap join may be held by a fillet, plug, or slot weld, and and a tee joint by a fillet or groove weld.
这些元素可以以不同方式组合在一起，例如：一个搭接接头可能用角接、塞焊和缝焊固定，一个丁字接头可以用一个搭接或槽焊来完成。
The elements can be put together in various ways. For example, a lap join may be held by a fillet, plug, or slot weld, and and a tee joint by a fillet or groove weld.
这些元素可以以不同方式组合在一起，例如：一个搭接接头可能用角接、塞焊和缝焊固定，一个丁字接头可以用一个搭接或槽焊来完成。
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