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A sensor is a piece of equipment that notices something — light, heat, movement, smoke, sound — and then sends a signal. Doors that open by themselves use a sensor. A phone is full of them. A smoke alarm is a sensor with a loud voice. It does not think; it only detects. The word was built in the early twentieth century to mean “a thing that feels.”
感測器（台灣說法；中國大陸較常說「傳感器」）。
組成Formed as a Latin-style word from sentiō (“to feel”) + -tor (“someone or something that does it”) — so “a feeler.” On the surface it also looks like sense + -or.
同家族的字
- senseto feel or notice; a sensor is “a thing that senses”
原始詞典資料1 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。
sensornoun/ˈsɛn.sə/
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A device or organ that detects certain external stimuli and responds in a distinctive manner.
- The smoke sensor triggered the alarm.
- Modern phones contain a light sensor that adjusts brightness.
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。