?? 詞語組成解析
a. [電]磁勢的
force
[f?:s]
n. 力;武力;（社會）勢力;魄力;
vt. 強迫;強行;促使，推動;強奸;
unit
['ju:nit]
n. 單位，單元;裝置;個體;[數(shù)]單位數(shù);
??? 情景例句
I never could tie one of those ...
我從來就不會打那一類的……
How long will it take you to repair it?
你要多久才能修好它？
In a few days I was learning and enjoying it like any child.
幾天之后，我像一個孩子那樣學習起來--而且學得很開心。