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动物解剖实验必须佩带口罩，以免发生生物污染。
During animal dissections, you need to wear masks to prevent infections.
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南开大学实验动物解剖学编写组。
Editing Group for Experimental Animal Anatomy of Nankai University.
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南开大学实验动物解剖学编写组。
Editing Group for Experimental Animal Anatomy of Nankai University.
youdao