A part can be used by zero to many sketches, and a sketch can contain zero many parts.
一个局部可以被从零到多个示意图来使用，而一个示意图可以包含零到多个局部。
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Once the new method, or part of the method, starts to emerge from the sketch, it is time to launch RMC, in which the method can be more formally and completely defined.