单词	roundworm
释义	roundworm /ˈraʊn(d)wəːm / noun A nematode worm, especially a parasitic one found in the intestines of mammals. Many species in the class Phasmida, including the large Ascaris lumbricoides in humans. Before the Ontario Ministry of Health decided that raw fish must be frozen before it can be served, no one was worried about parasitic roundworms.... Transmission of roundworm, whipworm and hookworm requires a warm wet environment to ensure survival of eggs or larvae in soil that is contaminated with human faeces. Canine heartworm is a serious and potentially fatal parasitic condition, transmitted by mosquitoes, in which roundworms develop in the heart and major blood vessels of dogs.
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