- 1
A plethora is a very large number of something, usually more than you need, and sometimes more than you really want.
A plethora這個字 is a very large number of something指某樣東西的數量非常多，usually通常 more than you need超過你所需要的，and sometimes有時候 more than you really want甚至超過你真正想要的。
The usual shape is a plethora of + things: a plethora of choices, a plethora of rules.
The usual shape is a plethora of + things常見的用法是「a plethora of + 名詞」，a plethora of choices, a plethora of rules像是很多選擇、很多規定。
It is a noun, and it sounds educated — even a little . News writers like it; so do students who want a fancy word for “many.” Though actually, in careful use there is often a tiny sigh inside it: not just “lots,” but “too many.” If you only mean a happy large amount, plenty of or a lot of is more natural.
It is a noun這是一個名詞，and it sounds educated聽起來很有學問，even a little showy甚至有點賣弄。 News writers like it新聞寫作者喜歡用它，so do students who want a fancy word for "many."想找一個比「many」更花俏的字的學生也是，Though actually不過其實，in careful use there is often a tiny sigh inside it在用心的用法裡這個字常帶著一絲嘆息：not just "lots," but "too many."不只是「很多」，而是「太多」，If you only mean a happy large amount如果你只是想表達開心的大量，plenty of or a lot of is more natural用 plenty of 或 a lot of 更自然。
Long ago doctors also used plethora for too much blood in the body; almost nobody means that now.
Long ago很久以前，doctors also used plethora醫生也用 plethora 這個字，for too much blood in the body指身體裡血太多，almost nobody means that now現在幾乎沒有人這樣用了。
組成From Late Latin plēthōra, from Ancient Greek πληθώρα (plēthṓra, “fullness, having had too much”), from πλήθω (plḗthō, “to be full”) + -η (a noun ending).
原始詞典資料2 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。
plethoranoun/ˈplɛθəɹə/
- 1
An excessive amount or number; an abundance.
- The menu offers a plethora of cuisines from around the world.
- 1817, Francis Jeffrey, review of Lalla Rookh, in the Edinburgh Review He labours under a plethora of wit and imagination.
- 2
medicinesciencesExcess of blood in the skin, especially in the face and especially chronically.
- [Y]our Character at Present is like a Person in a Plethora, absolutely dying of too much Health—
- The food necessary for the maintenance of his dog, a bull-terrier, in the condition of ferocious plethora to which it was accustomed, he generously declared himself willing to pay for out of his own pocket, […]
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。