activity tracker
noun/ækˈtɪvəti trækə(r)/
/ækˈtɪvəti trækər/
(also fitness tracker)
- a device that you can wear that records your daily physical activity, as well as other information about your health, such as your heart rate
活动追踪器：您可以穿戴的设备，用于记录您的日常体育活动以及有关健康的其他信息，例如心率