1)historic: famous in history, 歷史上著名的 associated with past times 與過去時代有關的

a ~ event/speech/spot

historical: belong to history 歷史上的

a ~ people/novel/play/film/painting

~ trend

2) electric: worked by, changed with， producing electricity 用電的，帶電的, 有電的

~ current/cable

electrical: relating to electricity, an idea of a less close connection with electricity

~ engineering/apparatus

3) economic: of economics

~ policy/geography/crisis/crops

economical: careful in the spending of money and time, not waste 經濟的，節儉的

an ~ housewife/store

4) industrial: of industries 工業的

the ~ revolution/products/system

industrious: hard-working, diligent

~ people

5) considerable: great much 相當多（大）的

a ~ income/distance

considerate: thoughtful 體諒的， 體貼的 周到的

She is ~ to others.

6) sensible: reasonable, having good sense 實用的， 明知
 

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