记忆方法
将“costly”与“cost”联系起来，想象“cost”字面上的花费概念变得昂贵或重大，因此“costly”就是形容花费很大的，代价高的。通过这种联想，可以更容易地记住单词“costly”的含义。
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英语词源
- costly (adj.)
- late 14c., from cost + -ly (1). Earlier formation with the same sense were costful (mid-13c.), costious (mid-14c.).
权威例句
- 1. Psychometric tests can save organizations from grim and costly mistakes.
- 心理测试能够使组织机构避免犯下损失惨重的大错。
- 2. The proposed regulations are ill-defined and cumbersome and could be unnecessarily costly.
- 提议的规章制度阐述不清、复杂低效，而且可能会带来不必要的过高花费。
- 3. At the required level of visual verisimilitude, computer animation is costly.
- 要使电脑动画的视觉效果达到要求的逼真程度，花费会十分昂贵。
- 4. Coastal defence is a costly business.
- 海防事务很耗费资财。
- 5. It can be costly to refinance.
- 再融资有时费用会很高。