Owing to bad ventilation ofclosed and semiclosed latrines,human health is impaired. 封閉型，半封閉型公廁因通風不良而對人體造成危害。
As offices and homes often have inadequate ventilation, these chemicals can build up to become health nuisances. 由於辦公室和住家往往通風不良，這些化學物質會愈積愈多進而成為危害健康的物質。
滬公網安備 31011502000490號
電信業務許可證編號：滬B2-20190700
