motion sensor

例子: 
The bank's security system included a motion sensor that could detect the movement of intruders.
Intel Free Press
https://flic.kr/p/cSweR7
照片许可: 
CC版权：出处标示，商业用途
Regionalism: 
Neutral
Regional variant: 
Neutral
Full Expression: 
: motion sensor
法语
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No
西班牙语
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No
德语
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No
葡萄牙语
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No

a device that contains a physical mechanism or electronic sensor that tracks motion

中文
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No
意大利语
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No
Alsacien
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No
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