- 1成本效益（性）；性價比（用於報告、政策評估的正式說法）
This is the noun: the quality of giving a good result for the money spent. Because it is a noun, you can measure it, compare it, question it, and study it — 'the cost-effectiveness of the programme', 'we need to prove cost-effectiveness', 'a cost-effectiveness study'. That is where you will actually meet it: in health policy and government it is close to a technical term. Health systems around the world run cost-effectiveness analyses to decide which treatments to pay for, comparing the money a treatment costs against the years of healthy life it gives back. So the word often carries a quiet weight — behind it are real decisions about what a public budget will and will not cover. It is uncountable: you say 'its cost-effectiveness', not 'a cost-effectiveness' or 'cost-effectivenesses'.
From the word’s history
From cost-effective + -ness.
由 cost-effective 加 -ness 組成。
組成cost-effective plus -ness, the ending that turns an adjective into a noun for the quality itself — like kind → kindness, dark → darkness. So: 'the state of being cost-effective'.
同家族的字
- cost-effectivethe adjective underneath it
- effectivenessthe same -ness noun built on the second half of the compound
- kindnessshares the -ness ending, which makes a noun of quality from an adjective
原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，摘錄並精簡格式，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
cost-effectivenessnoun
- 1
The property of being cost-effective.
- Life is cheap, never forget it. Corporations make marketing decisions by weighing the cost of being sued for your death against the cost of making the product safer. Your life is a factor in cost-effectiveness. So when you talk about murder, don't confine your discussion to individuals.
- BR had been called upon to install ATP across the entire network in the aftermath of the Clapham Junction rail crash that resulted in 35 deaths in December 1988 [...]. But progress had stalled due to the cost-effectiveness of the systems that were in development.
摘錄自 英文維基詞典 English Wiktionary，已精簡格式；依 CC BY-SA 4.0 授權使用，改動後的內容同樣以此授權提供。