这类似于 Go 的接口组合设计——每个 Adapter 是一个小接口，插件按需组合。
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想要在太空实现金属构件的3D打印难度超乎想象。
Well, let's get the obvious out of the way first. There's almost no kissing, and the disco is a million miles from the hedonistic gleam of Studio 54.
get desiredSize() { return closed ? null : 1; },