Ⅱ级安全柜
Grade Ⅱ biosafty cabinets
Ⅲ级安全柜
Grade Ⅲ biosafety cabinest
II级生物安全柜
II Class biosafety Cabinets
安全水深
safety depth of water-cushion
safety water depth
城市供水安全
safety of water supply in cities
城市交通安全水平
urban traffic safety level
防水安全煤岩柱
waterproof rock pillar
protective pillar against water
供水安全
water supply security
Safety of Urban Drinking Water
safety of Water Supply
water-supply safety
water supply safety
safe water supply
water supply-security