Efficacy 对比 Utility

Efficacy 是其中最正式的。

Utility 在日常英语中最常见。

在英语中何时使用每一个，包含含义、语域和例句。

Efficacy

正式10000 以上（较少见）

Utility

前 2000（常见）C1noun

最正式: Efficacy最常见: Utility

	Efficacy	Utility
发音	🇬🇧 //ˈɛfɪkəsi//🇺🇸 //ˈɛfɪkəsi//	🇬🇧 /["/juːˈtɪləti/"]/🇺🇸 /["/juːˈtɪləti/"]/
含义	Effectiveness or how well something works.	Something that is useful or helpful.
例句	The efficacy of the new vaccine was confirmed in clinical trials.	a privatized electricity utility
语域	正式	中性
常见程度	10000 以上（较少见）	前 2000（常见）
CEFR 等级	-	C1
词性		noun
搭配	clinical efficacy, evaluate efficacy, prove efficacy, demonstrate efficacy, measure efficacy	municipal, public, state-owned, company, bill, commission, great, high, limited, have, maximize, enhance, of… utility
反义	-	uselessness, ineffectiveness, inutility
常见错误	Confused with 'efficiency', which refers to doing things quickly and without waste., Often used without proper context; needs to specify what is being evaluated., Mispronounced, especially by non-native speakers.	Confused with 'utilize' — remember 'utility' is the noun form., Using it interchangeably with 'function' — 'utility' refers to usefulness, not just the role of something., Incorrectly pluralizing it as 'utilities' when referring to a general concept.
用法说明	Used primarily in formal contexts like research, medicine, and discussions about policy. Less common in everyday conversation.	Use 'utility' in technical or everyday contexts. It's common in discussions about services, tools, or resources. Avoid using it in casual or overly emotional topics.

常见问题：Efficacy 对比 Utility

Efficacy和Utility 有什么区别？

Efficacy: Effectiveness or how well something works. Utility: Something that is useful or helpful.

哪个更正式：Efficacy和Utility？

Efficacy 是其中最正式的。

哪个更常见：Efficacy和Utility？

Utility 在日常英语中最常见。

能各给一个例子吗？

Efficacy: The efficacy of the new vaccine was confirmed in clinical trials. Utility: a privatized electricity utility

我可以互换使用 Efficacy和Utility 吗？

不总是。Efficacy和Utility 相关，有时可以互换，但在语域、常见程度和用法上不同，所以换用可能改变意思或语气。替换前先看看上面的区别。