• 1. 第十二周: Week Twelve
• 2. 第二十一周: test

• 1.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.
  dict.yoduao.com
• 2.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.
  dict.yoduao.com

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