锯齿状链 (zig-zag) 是本课源文档中的必保知识点，前面页面未覆盖，需要单独补齐。
原文线索：lythene is a polymer whose hydrocarbon framework consists entirely of chains of carbon atoms. The wiggly line at ea
骨架式绘制的基础规则，反映真实键角
补齐高优先级知识点：锯齿状链 (zig-zag)。 原文线索：lythene is a polymer whose hydrocarbon framework consists entirely of chains of carbon at