记忆方法
1. ef- "out" + fic- + -acy. 在这里取 out 的引申义：完成、结束(finish, end)之意。
2. meaning: 事情做完了，事情做结束了. => work out, accomplish.
3. => 引申为：事情做完、做结束后的效果。=> 效果、功效。
4. efficacy + 变 y 为 i 加 -ous.
2. meaning: 事情做完了，事情做结束了. => work out, accomplish.
3. => 引申为：事情做完、做结束后的效果。=> 效果、功效。
4. efficacy + 变 y 为 i 加 -ous.
英语词源
- efficacious
-
efficacious: see effect
- efficacious (adj.)
- "sure to have the desired effect" (often of medicines), 1520s, from Latin efficaci-, stem of efficax "effectual, powerful" (see efficacy) + -ous. Related: Efficaciously; efficaciousness.
权威例句
- 1. They hope the new drug will prove especially efficacious in the relief of pain.
- 他们希望这种新药能在缓解疼痛方面产生特效。
- 2. It occurs to me that example is always more efficacious than precept.
- 我想到身教重于言教.
- 3. Qingdao is a resort efficacious for a variety of bodily ills.
- 青岛是一个对各种身体疾病都有疗效的疗养胜地.
- 4. This medicine is highly efficacious.
- 这药很灵验.
- 5. Vaccination for smallpox is efficacious.
- 种牛痘防天花是有效的.
相关单词
广而告之
1一秒钟记单词小学英语单词记背神器英语一二三四五六年级人教版英语词汇汇总表单词记背神器 单词记忆书单词词汇速记强化训练
【推荐理由】赠运费险，热门商品
【现价】27.9
【下单链接】38￥ CZ3457 5OArdvEMFvn￥