英文關鍵字
aged
alert
area
attention
background
bacteria
bio
biohazard
biologic
biological
biology
brick
caution
cement
contamination
cracked
danger
dangerous
design
dirty
environment
epidemic
forbidden
graphic
hazard
hazardous
health
infection
isolated
lab
paint
pictogram
poison
prohibition
protect
protection
restricted
risk
safety
scientific
security
sign
specimen
substance
symbol
toxic
virus
waste
weapon