词汇	double seal manhole cover
释义	double seal manhole cover 人孔复式封盖
随便看	convective region convective Richardson number convective scale convective shower convective stability convective storm convective storm environment convective storm rainfall convective storm splitting models convective-stratiform mixed clouds convective strong precipitation convective symmetric instability convective-symmetric instability convective system convective teansport convective temperature convective temperaturect convective term convective theory of cyclogenesis convective thermal control convective thermal environment convective thunderstorm convective tornado convective torrential rain convective transfer