deductionKK [dɪˋdʌkʃən] /dɪˈdʌkʃən/發音de- 向下、除去+duct 引導+-ion 名詞→從中引出、引開展開收合de-字首向下、除去duct字根引導-ion字尾名詞字面：從中引出、引開從總額中引走一部分即為扣除；從前提引出結論即為推論、演繹。名詞1扣除、扣除額、減免After all the deductions, my monthly salary looks much smaller.扣除各項費用後，我的月薪看起來少了很多。2推論、推斷Her deduction about the missing key turned out to be correct.她對那把不見的鑰匙所做的推論後來證明是正確的。3演繹、演繹法The detective solved the case by careful deduction rather than luck.那位偵探靠的是縝密的演繹推理，而不是運氣。