STEM与日常科技·英语30篇（7）

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免触式洗手液分配器如何准确测量手掌尺寸

Touchless soap dispensers use infrared time-of-flight sensors to estimate hand size before dispensing.
They emit invisible light pulses and calculate distance based on how long light takes to bounce back.
By scanning multiple points across the palm area, they build a rough 3D profile in under half a second.
This prevents over-dispensing for small hands or under-dosing for larger ones.
Algorithms adjust output volume depending on detected surface area and proximity.
Some models even learn user habits after repeated use to refine future responses.
The sensor must distinguish hands from other objects like bags or sleeves using motion context.
Power efficiency matters, so systems activate only when motion enters a defined detection zone.
Calibration occurs during manufacturing and rarely needs field adjustment due to stable optics.
This precision reduces waste and improves hygiene in hospitals and schools alike.

听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。

This prevents over-dispensing for small hands or under-dosing for larger ones. 这可避免小手出液过多或大手出液不足。
Algorithms adjust output volume depending on detected surface area and proximity. 算法根据检测到的表面积和距离动态调整出液量。
This precision reduces waste and improves hygiene in hospitals and schools alike. 这种精准控制既减少浪费，又提升了医院和学校的卫生水平。

这篇中文题目最接近哪一句？免触式洗手液分配器如何准确测量手掌尺寸一次学校运动会的通知一份超市购物清单

课文第一句的意思更接近？非接触式皂液分配器利用红外飞行时间传感器，在出液前估算手部尺寸。今天学校放假了。请把窗户打开。

这一课主要在讲什么？（看英文标题） How Touchless Soap Dispensers Measure Hand Size Accurately How to cook noodles A maths worksheet

This prevents over-dispensing for small hands or under-dosing for larger ones.

This prevents over-dispensing for small hands or under-dosing for larger ones.

第一版：录下来、回听、再听标准音。系统打分以后再加。

用今天的表达，自己说一句。

例子：This prevents over-dispensing for small hands or under-dosing for larger ones.