Por·ton Down /ˌpɔːtn ˈdaʊn $ ˌpɔːr-/ a place in the south of England where there is a government laboratory used for studying chemical weapons and biological weapons (=weapons that use bacteria to kill people by giving them diseases) 波顿唐〔英格兰南部一地区，一个研究化学武器和生物武器的政府实验室坐落于此〕