儀器與系統的反應度
這一組是核心畫面最乾淨的樣子：一個可測量的反應度，沒有情緒，只有刻度。
sensitivity of an instrument · noun · C1
How well a tool, machine, or living thing notices very small changes in light, heat, or movement.
靈敏度
核心畫面
One way to hold it: how much something registers from a small signal. A very sensitive instrument moves when almost nothing happens. Point that at a machine and you get precision; at a body you get allergy; at a person you get both the gift of noticing others' feelings and the trouble of being easily hurt.
一台儀器的指針有多容易動。極輕的一點光、一點熱、一點震動就讓它整個跳起來，那就是高 sensitivity；要用力搖…更多收起
一台儀器的指針有多容易動。極輕的一點光、一點熱、一點震動就讓它整個跳起來，那就是高 sensitivity；要用力搖它才有反應，那就是低。這個「小刺激、大反應」的畫面往三個方向走出去。指向機器，是精密度；指向身體，是一碰到某樣東西就出狀況的過敏；指向人，就分成一體兩面——你很容易接收到別人的情緒（這是體貼），也很容易被別人的話刺到（這是玻璃心）。同一個特質，只是誰在承受它不同。From the word’s history
Built transparently in English from sensitive + -ity, i.e. 'the state of being sensitive'. sensitive itself goes back through Medieval Latin sensitivus to Latin sentire 'to feel, perceive' — the same root under sense, sentiment and consent.
構詞很直白：sensitive（敏感的）+ -ity（性質、程度）＝「敏感的狀態或程度」。sensitive 再往上追，經中世紀拉丁語 sensitivus 回到拉丁語 sentire「感覺、察覺」——sense、sentiment、consent 都是這一家人。知道這條線很有用：只要看到 sens- 這個字根，通常就跟「接收到什麼」有關，而 -ity 把它變成一個可以測量、可以多可以少的量。所以 sensitivity 天生就是一個有刻度的字。
Wiktionary (sensitivity, sensitive): sensitive + -ity; sensitive from Medieval Latin sensitivus, from Latin sentire 'to feel, perceive'.
Four branches
身體對外物的過度反應
同樣是「小刺激、大反應」，但落在身體上，而且反應是不舒服的：一點點花粉、一點點牛奶，身體就出狀況。
allergy · noun · C1
A bad body reaction to a food, chemical, animal, or other thing, so the person becomes unwell.
過敏
察覺並顧及別人的感受
把那根靈敏的指針指向別人：你接收得到他們沒說出口的情緒，並且據此調整自己的言行。這是核心畫面裡最正面的一支。
empathy, tact · noun · C1
The skill of noticing how other people feel and what is hard for them, and treating them with care.
體諒
容易被刺到的那一面
同一根靈敏的指針，這次量的是自己受傷的程度：別人一句普通的話，在你身上引起很大的反應。體諒是把敏感朝外用，這一支是敏感朝內。
touchiness · noun · C1
The fact that someone is easily hurt or made angry by what other people say.
敏感
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。
sensitivitynoun/ˌsɛn.sɪˈtɪv.ɪ.ti/
- 1
The quality or state of being sensitive; sensitiveness.
- In any event, the incident, and the media attention it attracted, highlights the sensitivity of language politics in Singapore and is reflective of the fact that this sensitivity extends to campus life.
- Owing to sensitivities about the force's capabilities, Russell is unable to say how many drones BTP has, or where and when they operate. But he does confide that the force works hand in hand with the helicopter service, and its ability to deploy drones is getting quicker.
- 2
biologynatural-sciencesThe ability of an organism or organ to respond to external stimuli.
- The single-imaging optic of the mammalian eye offers some distinct visual advantages. Such lenses can take in photons from a wide range of angles, increasing light sensitivity. They also have high spatial resolution, resolving incoming images in minute detail.
- A coenzyme that exists in all living cells, NAD+ plays a central role in the body’s biological processes, such as regulating cellular energy, increasing insulin sensitivity and reversing mitochondrial dysfunction.
- 3
biologymedicinenatural-sciencesThe ability of an organism or organ to respond to external stimuli.
- 4
mathematicssciencesstatisticsThe probability, in a binary classification test, of a true positive being correctly identified.
- Coordinate term: specificity
- 5
businesselectrical-engineeringelectricityThe degree of response of an instrument to a change in an input signal.
- Up to 1,884 microplastic particles were found per cubic metre of seawater in some locations, up to 18 times higher than in similar tests during the last Ocean Race, which ended in 2018. Scientists noted that the sensitivity of their instruments is now higher.
- 6
gamesgamingThe rate at which the player's facing direction or position changes relative to input device movement.
- Since he played with high sensitivity, he only needed to move the mouse a tiny distance to rotate a full 360 degrees.
- 7
artshobbieslifestyleThe degree of response of a film etc. to light of a specified wavelength.
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。