英文關鍵字
acid
archaeological
archaeology
background
business
chemical
clean
coin
coins
converter
copper
currency
develops
digger
economy
equipment
felt
finance
financial
gradually
hand
history
hobby
liquid
man
metal
money
new
normal
numismatics
numismatist
ointment
patinated
patination
phosphoric
protect
protective
relief
rubs
rust
safety
saving
soda
sulfuric