attention
cave
chemical
danger
drainage
drainage ditch
drainage outlet
experiment
facilities
factory
glass
industrial
industrial complexes
industrial zones
industry
inhaling
inspection
laboratory
laboratory equipment
manufacturing
mechanical
medicine
meters
pipe
piping
plant
public facilities
research
research and development
rust
science
stairs
stepladder
tourist areas
tube
underground
valves
water
water flow meter
water groove
water pressure
water supply groove
work clothes