Owing to bad ventilation ofclosed and semiclosed latrines,human health is impaired. 封闭型,半封闭型公厕因通风不良而对人体造成危害。
As offices and homes often have inadequate ventilation, these chemicals can build up to become health nuisances. 由于办公室和住家往往通风不良,这些化学物质会愈积愈多进而成为危害健康的物质。