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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'.
This這是 is the noun名詞：the quality這種特質，of giving a good result給出好結果，for the money spent以花掉的錢來說。Because it is a noun因為它是名詞，you can measure it你可以測量它、compare it比較它、question it質疑它、and和 study it研究它——'the cost-effectiveness of the programme'像「這個方案的成本效益」、'we need to prove cost-effectiveness'「我們需要證明成本效益」、'a cost-effectiveness study'「一份成本效益研究」。
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.
That is where你會真正遇到它的地方是這裡 you will actually meet it：in health policy and government在健康政策和政府部門裡，it它 is close to a technical term算是接近專業術語。Health systems around the world世界各地的醫療體系 run cost-effectiveness analyses會進行成本效益分析，to decide which treatments to pay for來決定要支付哪些治療，comparing the money a treatment costs比較一項治療花的錢 against the years of healthy life it gives back跟它換回來的健康壽命年數。So所以 the word這個詞 often carries a quiet weight常常帶著一種沉重感——behind it在它背後 are real decisions是真實的決定，about what a public budget will and will not cover關於公共預算會不會涵蓋什麼。
It is uncountable: you say 'its cost-effectiveness', not 'a cost-effectiveness' or 'cost-effectivenesses'.
It它 is uncountable是不可數名詞：you say你會說 'its cost-effectiveness'「its cost-effectiveness」，not不會說 'a cost-effectiveness'「a cost-effectiveness」 or或 'cost-effectivenesses'「cost-effectivenesses」。
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，原文照列，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
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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.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。