We'll talk about cell culture engineering during Week 4, how do you maintain cells in culture, what are the limits of this.
第四周我们会探讨细胞培养工程,人们如何在培养基中维持细胞的存活,这种方法的局限性是什么
This is the end of week four.
这个第四周最后一次课。
Alright, welcome back to CS50, this is the start of week 4.
欢迎来到CS50学堂,这是第四周的课程。
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