STEM与日常科技·英语30篇（9）
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How Smart Toothbrushes Track Brushing Time and Pressure
智能牙刷如何追踪刷牙时长与力度
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Smart toothbrushes vibrate gently when you brush too hard on your gums.智能牙刷在你刷牙力度过大、伤及牙龈时会轻柔震动提醒。
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They count seconds automatically and stop after the recommended two minutes.它自动计时，两分钟推荐时长一到即自动停止。
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A small sensor inside the handle measures how much pressure you apply.手柄内置小型传感器，可测量你施加的压力大小。
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The brush connects to an app that shows which areas you missed yesterday.牙刷连接手机App，显示你昨天遗漏的清洁区域。
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Kids love seeing cartoon stars appear for consistent morning brushing.孩子喜欢看到卡通星星因坚持晨间刷牙而出现。
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Battery lasts about three weeks before needing a quick USB charge.电池续航约三周，之后只需用USB快速充电。
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Some models play a soft chime every 30 seconds to guide timing.部分型号每30秒发出柔和提示音，辅助掌握刷牙节奏。
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The app reminds you to replace the brush head every three months.App会在三个月后提醒你更换刷头。
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You can compare brushing data with family members using shared accounts.通过共享账户，可与家人对比刷牙数据。
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Even without the app, the brush still gives real-time pressure feedback.即使不使用App，牙刷仍能实时反馈刷牙压力。