英文關鍵字
acid
archaeological
archaeology
background
business
checks
chemical
clean
cleaning
coin
coins
container
converter
copper
corroded
currency
degree
digger
economy
equipment
finance
financial
hand
history
hobby
lie
liquid
man
metal
money
new
normal
numismatics
numismatist
ointment
patination
phosphoric
protect
protective
rust
safety
saving
soda
sulfuric
their
they