timer
🇺🇸
/ˈtaɪmər/
🇬🇧
/ˈtaɪmə(r)/
A device that helps you keep track of time or that controls when something starts or stops.
The chef used a timer to make sure the cookies baked for exactly ten minutes.
廚師使用計時器確保餅乾烤了整整十分鐘。