STEM与日常科技·英语30篇（7）

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自动门为何无需触碰即可开启

Most automatic doors use microwave or passive infrared motion sensors to detect approaching people.
Microwave sensors emit low-power waves and measure reflections from moving objects.
Passive infrared sensors detect body heat changes as someone walks toward the doorway.
A microcontroller processes signals and activates the motor only when motion is confirmed.
Safety beams near the floor prevent doors from closing on feet or bags.
Door speed and opening width are calibrated to accommodate wheelchairs and strollers.
Energy-efficient designs include standby modes that reduce power consumption when idle.
Some models integrate with building access systems to unlock only for authorized users.
Weather-resistant housings protect internal electronics from rain, dust, and temperature extremes.
Maintenance alerts notify facility staff when sensor sensitivity drops below safe thresholds.

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

Microwave sensors emit low-power waves and measure reflections from moving objects. 微波传感器发射低功率波，并测量移动物体反射的信号。
Energy-efficient designs include standby modes that reduce power consumption when idle. 节能设计包含待机模式，在空闲时降低功耗。
Weather-resistant housings protect internal electronics from rain, dust, and temperature extremes. 防风雨外壳保护内部电子元件免受雨水、灰尘及极端温度影响。

这篇中文题目最接近哪一句？自动门为何无需触碰即可开启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？大多数自动门采用微波或被动红外运动传感器来探测接近的人。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） Why Automatic Doors Open Without Touching How to cook noodles A maths worksheet

Microwave sensors emit low-power waves and measure reflections from moving objects.

Microwave sensors emit low-power waves and measure reflections from moving objects.

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：Microwave sensors emit low-power waves and measure reflections from moving objects.