十万个为什么·科学启蒙30篇（4）

15 / 30

已读 0 / 30 课

为什么打喷嚏会闭眼

Sneezing is a powerful reflex triggered by irritation in the nasal passages or throat.
Nerves in the nose send signals to the brainstem, which coordinates multiple muscle groups simultaneously.
One automatic response is tightening the eyelid muscles, causing eyes to shut tightly without conscious control.
This protective action helps prevent irritants, mucus, or tiny particles from entering the eyes during the explosive exhale.
The force of a sneeze can exceed 100 miles per hour, making eye protection especially important.
Even people who try to keep their eyes open usually cannot override this hardwired reflex.
Scientists believe blinking during a sneeze may also stabilize head position for better respiratory efficiency.
The entire sequence—from trigger to eye closure—takes less than half a second.
It is not caused by air pressure pushing the eyes shut, as some myths claim.
This reflex highlights how closely linked our sensory and motor systems are for survival.

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

The entire sequence—from trigger to eye closure—takes less than half a second. 从触发到闭眼的整个过程耗时不到半秒。
Sneezing is a powerful reflex triggered by irritation in the nasal passages or throat. 打喷嚏是一种强烈的反射动作，由鼻腔或咽喉受刺激引发。
This reflex highlights how closely linked our sensory and motor systems are for survival. 这一反射凸显了我们的感觉系统与运动系统为生存而紧密协作。

这篇中文题目最接近哪一句？为什么打喷嚏会闭眼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？打喷嚏是一种强烈的反射动作，由鼻腔或咽喉受刺激引发。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 We Close Our Eyes When We Sneeze How to cook noodles A maths worksheet

The entire sequence—from trigger to eye closure—takes less than half a second.

The entire sequence—from trigger to eye closure—takes less than half a second.

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：The entire sequence—from trigger to eye closure—takes less than half a second.