至第十二周，成纤维细胞合成网状纤维、弹性纤维和胶原。

By the twelfth week, fibroblasts are actively synthesizing reticulum fibers, elastic fibers, and collagen.

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在第十二周的早些时候，达拉斯牛仔队的20 - 16击败鹰在费城。

Earlier inside the twelve weeks the Dallas Cowboys beat the Eagles 20-16 in Philadelphia.

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缴交期限：第十二次讲授后一周。请注意如果未按时缴交则将有课程未完成的风险。

Due date: A week after Lecture 12 . Please note that you risk of an Incomplete if you miss the due date.

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