Methods Primary human corneal fibroblasts of passages 4 were used in this research.
方法原代培养角膜基质细胞，选取第4代细胞进行实验。
From book one to book three are passages specifically designed for foreign learners, but book 4 contains all the passages from contemporary magazines and periodicals.
从预订一本书有三个通道，专为外国学生，但第四册包含了所有通道，从当代杂志和期刊。
These cell colonies could be cultured at least up to 4 passages.
细胞克隆均至少能培养4代以上；
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