书籍 Insight - 中级 - 单元 9 - 9C

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

小工具, 装置

favorable or well-suited for a specific purpose or situation

便利的, 适合的

having a high price

昂贵的, 价格高的

no longer useful or fashionable

having a reasonable price

便宜的, 价格合理的

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

高效的, 有效的

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

耐用的, 坚固的

easily damaged or broken

脆弱的

able to be trusted to perform consistently well and meet expectations

可靠的, 可信赖的