Many parasitologists have studied immune prophylaxis and treatment of parasitoses for about one hundred years all over the world.
全世界的一些寄生虫学工作者，在近百年的时间里，进行着寄生虫病的免疫防治研究。
Many parasitologists have studied immune prophylaxis and treatment of parasitoses for about one hundred years all over the world.
全世界的一些寄生虫学工作者，在近百年的时间里，进行着寄生虫病的免疫防治研究。
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