英文關鍵字
accountant
accounting
addition
apparatus
appliance
banknote
billing
bills
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calculating
calculation
calculator
calculus
clicking
closeup
college
creditcost
currency
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decimal
device
digit
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finane
fractions
homework
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instrument
investments
investor
loans
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math
modern
old
paying
planning
pressing
retro
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soviet
vintage
workstation