书籍 Insight - 中级 - 单元 9 - 9C

a mechanical tool or an electronic device that is useful for doing something

favorable or well-suited for a specific purpose or situation

having a high price

no longer useful or fashionable

having a reasonable price

(of a system or machine) achieving maximum productivity without wasting much time, effort, or money

able to last for a long time without breaking or wearing out easily

easily damaged or broken

able to be trusted to perform consistently well and meet expectations