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镜子为什么左右颠倒，却不上下颠倒？

When you raise your right hand, the mirror image raises what looks like its left hand.
This happens because mirrors don’t actually flip left and right — they flip front to back.
Light travels straight from your nose to the mirror and bounces back toward you.
So the reflection reverses depth, not horizontal or vertical orientation.
If you lie on your side, the mirror will seem to swap up and down instead.
Your brain interprets the reversed depth as a left-right swap because you rotate to face others.
Try pointing directly at the mirror: your finger and its image point at each other, not sideways.
No mirror can reverse top and bottom unless you change your own position relative to it.
Understanding this helps clarify how optical symmetry works in everyday life.
It also shows why written text appears backward — the reversal is about direction, not labels.

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

So the reflection reverses depth, not horizontal or vertical orientation. 因此，镜像反转的是深度，而非水平或垂直方向。
Understanding this helps clarify how optical symmetry works in everyday life. 理解这一点有助于厘清日常生活中光学对称的原理。
Light travels straight from your nose to the mirror and bounces back toward you. 光线从你的鼻尖直线射向镜子，再反射回你的眼睛。

这篇中文题目最接近哪一句？镜子为什么左右颠倒，却不上下颠倒？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？当你举起右手时，镜中的影像看起来举起了它的左手。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 Do Mirrors Reverse Left and Right, Not Up and Down? How to cook noodles A maths worksheet

So the reflection reverses depth, not horizontal or vertical orientation.

So the reflection reverses depth, not horizontal or vertical orientation.

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：So the reflection reverses depth, not horizontal or vertical orientation.