強調：正是那群人本身
從「彈回自己」轉個角度：不再是動作落回身上，而是用這個「自己」去加重語氣，指著「正是那一群、不是別人」。鏡子還在，只是這次用來把焦點牢牢釘在他們本人。
emphatic: they themselves · pronoun · A2
Used right after 'they' or a plural noun to make it stronger: those exact people.
他們本身
核心畫面
You can think of themselves as a mirror turned back on a group: the people who do something are the very same people it lands on. From that one idea — the action bouncing back to its own — come all the other uses: pointing emphatically at exactly those people, standing for one unnamed person, and a handful of fixed phrases (by themselves, to themselves, in themselves, not feel themselves) that all keep that 'the group itself, on its own' feeling.
可以想成一面照回自己的鏡子：做某件事的那群人，正好也是這件事落到的那群人。動作彈回到做事者本身——這個核心畫面長出後…更多收起
可以想成一面照回自己的鏡子：做某件事的那群人，正好也是這件事落到的那群人。動作彈回到做事者本身——這個核心畫面長出後面所有用法：用力指向「正是那群人」、代替一個沒講明性別的單一個人、以及幾個固定片語（by/to/in themselves、not feel themselves），它們都還帶著「那群人自己、靠自己」的味道。From the picture
固定片語：自己、本身、不對勁
幾個鎖死的片語，都還帶著核心那股「他們自己、靠自己」的味道，只是各自固定成一個慣用說法：獨自一人、靠自己完成、就其本身而言、以及不像平常的自己。
by themselves (alone) · pronoun · A2
In the phrase 'by themselves': with no other people there; alone.
獨自
Also in this word
reflexive: themselves · pronoun · A2
Used to show that the people who do something are also the ones it happens to.
他們自己
themselves (singular, gender-neutral) · pronoun · A2
Used for one person after words like 'everyone' or 'someone' when you don't say if they are a boy or girl.
他自己（單數中性）
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。
themselvespron/ðɛmˈsɛlvz/
- 1
The reflexive case of they, the third-person plural personal pronoun. The group of people, animals, or objects previously mentioned, as the object of a verb or following a preposition (also used for emphasis).
- They’ve hurt themselves.
- They fought among themselves.
- 2
The reflexive case of they, the third-person singular personal pronoun. The single person previously mentioned, as the object of a verb or following a preposition (also used for emphasis).
- Would whoever stole my phone please make themselves known.
- I don't want anyone to fight among themselves.
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。