improper ventilation

• 通风不良

improper ventilation的用法和样例：

例句

1. 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。
2. 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。