Forward and backward deduction
[計] 前后推導
?? 詞語組成解析
forward
['f?rw?d]
adv. 前進地;向前;至將來;提前地;
adj. 向前方的;迅速的;（社會、政治）進步的;早熟的;
vt. 促進，助長;（按新地址）轉寄;發送;
n. 前鋒;
for前 + ward向... → ad.向前；今后，往后\r\nv.轉發
and
[?nd, ?n,?nd]
conj. 和，與;而且;于是，然后;因此;
deduction
[d?'d?k??n]
n. 推演，推理，演繹;（推理所得出的）結論;扣除，減除;扣除的量;
duc,duct =lead,bring,表示”引導,帶來”#詞根助記：de向下+duce引→向下引→推論
??? 情景例句
Whereabouts are you headed?
你要去哪？
I've been here for three weeks, and so far I've enjoyed it.
我已經在這里逗留了三個星期，到現在為止，我過得很好。
but Mr.Scott cannot get a telephone for his new garage, so he has just bought twelve pigeons.
但詹姆斯。斯科特先生未能為他新的汽車修理部搞到一部電話機，所以他買了只鴿子。