5视频豆瓣9.2
1视频豆瓣8.9
10视频
6视频
7视频豆瓣7.5
科学家穿着实验服,戴着手套,准备从试管中取出样品放在显微镜下。
Scientist in a lab coat and gloves preparing a sample from a test tube to put under a microscope.
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