Biological disasters refer to the harm or harm to staff caused by the handling of microbial pathogens or materials containing microbial pathogens and other infected individuals.
aster?
Water hyacinth propagates very fast. A large number of water hyacinth cover the river, which is easy to deteriorate the water quality and affect the growth of underwater organisms. Water hyacinth has appeared in Dianchi Lake, Taihu Lake and other places