英文關鍵字
accountant
accounting
addition
appliance
banking
banknote
billing
bills
budget
business
calculate
calculating
calculation
calculator
calculus
clicking
closeup
college
count
currency
data
decimal
device
engineering
financial
finane
fractions
homework
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investments
investor
loans
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male
man
math
modern
old
paying
planning
point
pressing
retro
russia
sliderule
values
vintage