心力聚到一點（專注）
把「往中心聚攏」這個動作用在你的注意力上：不讓心思散到別處，全收到一件事上面。
ability to focus · noun · B2
The ability to think carefully about one thing for a long time without letting other things distract you.
專注力 / 專心
核心畫面
You can picture concentration as everything being pulled in toward one single center point. Scattered things — grains, people, your attention, particles in water — get drawn together and packed tight at one spot instead of spread out. Whether it's a crowd, a chemical, or your mind, the same move is happening: gather it all to the middle.
可以想成：把原本散開各處的東西，全部往同一個中心點拉攏、聚成一團。不管是人群、化學物質，還是你的注意力，做的都是同一…更多收起
可以想成：把原本散開各處的東西，全部往同一個中心點拉攏、聚成一團。不管是人群、化學物質，還是你的注意力，做的都是同一個動作——把分散的東西收攏到中間、密密地堆在一處，而不是攤得到處都是。From the word’s history
From con- (together) + centrum (center): to bring things to a common center. Every modern sense keeps that image of gathering toward one point; the 'focus the mind' sense (1860s) is that same move applied to your mental powers.
來自 con-（一起）＋ centrum（中心）：把東西帶到同一個中心。所有現代意思都保留這個「往一點聚攏」的畫面；「專心」這個意思（十九世紀才出現）就是把同一個動作用在你的心神上——把心力全收到一個點。
etymonline.com/word/concentration
Two branches
東西聚在一處（密集·濃度）
最貼近字根的一支：實實在在把東西聚到一處。從「一堆東西擠在一個地方」再往裡收一層，就是「一份液體裡塞了多少某種物質」。
cluster in one place · noun · B2
A large amount of something gathered together in one place or among one group of people.
集中 / 密集
原始詞典資料8 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。
concentrationnoun/ˌkɒn.sənˈtɹeɪ.ʃən/
- 1
The act, process or ability of concentrating; the process of becoming concentrated, or the state of being concentrated.
- The Koreans Almost all the Koreans in China live in the north-eastern provinces. The greatest concentration is found in an area of approximately 1,200 square miles in Kirin Province, an area which is part of the Yen-pien Korean Autonomous Chou.
- 2
The act, process or ability of concentrating; the process of becoming concentrated, or the state of being concentrated.
- 3
The act, process or ability of concentrating; the process of becoming concentrated, or the state of being concentrated.
- 4
The act, process or ability of concentrating; the process of becoming concentrated, or the state of being concentrated.
- 5
A field or course of study on which one focuses, especially as a student in a college or university.
- 6
The proportion of a substance in a whole.
- The Koreans Almost all the Koreans in China live in the north-eastern provinces. The greatest concentration is found in an area of approximately 1,200 square miles in Kirin Province, an area which is part of the Yen-pien Korean Autonomous Chou.
- Surprisingly, this analysis revealed that acute exposure to solvent vapors at concentrations below those associated with long-term effects appears to increase the risk of a fatal automobile accident. Furthermore, this increase in risk is comparable to the risk of death from leukemia after long-term exposure to benzene, another solvent, which has the well-known property of causing this type of cancer.
- 7
chemistrynatural-sciencesphysical-sciencesThe proportion of a substance in a whole.
- 8
The matching game pelmanism.
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。