英文關鍵字
atomic
barrel
barrels
chemical
container
containing
contaminate
contamination
danger
disaster
drum
dump
ecology
environment
gallon
garbage
hazard
hazardous
industrial
industry
isotope
material
metal
nature
nuclear
poison
pollution
radiation
radioactive
radioactivity
rendering
risk
safety
steel
symbol
tank
toxic
uranium
warning
waste
white
yellow
yellows