the process of reaching a decision or answer by thinking about the known facts, or the decision that is reached

Through a process of deduction, the detectives discovered the identity of the killer. 经过一番仔细推断，警探们搞清了杀手的身份。

All we can do is make deductions from the available facts. 我们只能根据目前掌握的情况作出各种推论。

the calculation of taking an amount or a part of something away from a total or the amount that is taken away

The interest I receive on my savings account is paid after the deduction of tax. 付给我的存款利息已经扣了税。

an amount that is taken away from the money you are paid before you officially receive it

After deductions, his taxable income is $30,000. 除掉免税项目后，他的应税收入为3万美元。