You set out to achieve something, and afterwards you ask: did it actually do the job? This noun names the answer to that question — how far the thing worked. The two formal senses listed under this entry point instead at whether a rule is in force and how much real power it has; those ideas are normally carried in English by the adjective 'effective' or the phrase 'come into effect', so treat them as belonging to that neighbouring form rather than as everyday meanings of this noun.
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原始詞典資料3 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。
effectivenessnoun/ɪˈfɛk.tɪv.nɪs/
- 1
The property of being effective, of achieving results.
- The effectiveness of the drug was well established.
- 2
The capacity or potential for achieving results.
- The problem with these precedents is that the Security Council did not authorize intervention in Syria, and an intervention there will thus harm, not help, the Council’s credibility and effectiveness.
- 3
The degree to which something achieves results.
- He questioned the effectiveness of the treatment.
- United were having more possession but a sign of the effectiveness of Liverpool's defence was that it took the visitors 76 minutes to force Mignolet into serious action, when he dived to punch away a shot from substitute Nani.
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。