Ⅲ．单元重点难点(Difficulties and focuses) Period One：Warming Up 8L Pre-reading
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单元重点难点
Key and difficult points of unit
以上为机器翻译结果，长、整句建议使用 人工翻译 。
同时合理进行网壳单元划分，并详细阐述拱壳结构施工过程中的重点难点及关键技术。
Besides, the shell unit was divided reasonably. The key and difficult technologies were introduced during the process of construction.
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