加東西進去，讓內容變厚
直接就是核心畫面：往裡面添加，使含量提高。
improve quality · verb · C1
To make something better in quality, especially by adding something extra to it.
使豐富
核心畫面
A picture worth holding: something already exists, and you add to it so that it now holds more of the good stuff. Not making it bigger — making it denser, fuller, worth more per unit than it was before.
一樣東西本來就在那裡，你往裡面加了些什麼，於是它「含量」變高了。注意重點不是變大，而是變濃、變厚、變得更有內容——同…更多收起
一樣東西本來就在那裡，你往裡面加了些什麼，於是它「含量」變高了。注意重點不是變大，而是變濃、變厚、變得更有內容——同樣一份土壤、同樣一段人生、同樣一杯牛奶，加了東西之後，每一份裡面「好東西」的比例都提高了。en-（使…）+ rich（富含）合起來就是「使某物富含某物」，而 rich 在英文裡本來就不只指錢，也指「含量高」（rich soil 肥沃的土、rich in vitamins 富含維他命）。抓住這一點，這個字的三種用法就串在一起了。From the word’s history
Middle English enrichen, from Old French enrichir; by surface analysis simply en- ("to make") + rich. The core has never moved: to make something rich in something.
這個字的構造直接寫在臉上：en-（使）+ rich（富有、含量高），古法語 enrichir 就是這樣組起來的。所以與其記三個中文翻譯，不如記「使…變得富含」這一件事——差別只在於「富含什麼」：養分、金錢，還是可裂變的鈾。
Wiktionary, "enrich" (Middle English enrichen ← Anglo-Norman enrichir / Old French enrichier; surface analysis en- + rich)
Two branches
核燃料的濃縮
同樣是「提高有用成分的比例」，只是這個比例被寫進了物理與國際政治的專門術語裡。
enrich nuclear fuel · verb · C1
To increase the useful material in nuclear fuel so that it can produce more power.
濃縮
原始詞典資料7 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。
enrichverb/ɪnˈɹɪt͡ʃ/
- 1
To enhance.
- 2
To make (someone or something) rich or richer.
- Hobbies enrich lives.
- The choke in a car engine enriches the fuel mixture.
- 3
To adorn, ornate more richly.
- 4
To add nutrients or fertilizer to the soil; to fertilize.
- European adventurers found themselves within a watery world, a tapestry of streams, channels, wetlands, lakes and lush riparian meadows enriched by floodwaters from the Mississippi River.
- 5
natural-sciencesphysical-sciencesphysicsTo increase the amount of one isotope in a mixture of isotopes, especially in a nuclear fuel.
- The head of the UN’s nuclear watchdog says US strikes on Iran fell short of causing total damage to its nuclear program and that Tehran could restart enriching uranium “in a matter of months,” contradicting President Donald Trump’s claims the US set Tehran’s ambitions back by decades.
- 6
To add nutrients to foodstuffs; to fortify.
- 7
chemistrynatural-sciencesphysical-sciencesTo make to rise the proportion of a given constituent.
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。