英文關鍵字
yellow
equipment
metal
sign
nature
drop
environment
water
danger
pattern
protection
sea
industrial
frame
rusty
hands
symbol
gloves
industry
ecology
biological
toxic
fish
work
tool
beach
ocean
waste
rust
problem
trouble
barrel
universe
biohazard
virus
worker
tank
poison
dead
resource
petroleum
shortage
bane
bio hazard
world around