The Face class contains two methods that perform extrusion: pushpull and followme.
Face 类包含两个执行挤压的方法：pushpull 和 followme。
The second extrusion method is followme, which serves the same purpose as SketchUp's followme tool.
第二个挤压方法是 followme，该方法与 SketchUp 的 followme 工具的作用是一样的。
Although pushpull only extrudes in a single direction, followme extrudes in whatever direction you like.
pushpull只在一个方向上挤压，而followme则可以在任意方向上挤压。
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