<單字複習>
已選單詞
agreement
basic
border
boundary
business
cash
center
commerce
commitment
constraint
contract
core
credit
currency
deal
debt
duty
economy
edge
essential
exchange
finance
freedom
fundamental
heart
industry
interest
liberty
limit
loan
middle
money
necessity
need
oath
obligation
pact
privilege
promise
requirement
responsibility
restriction
right
trade
transaction
treaty
vow
