十万个为什么·科学启蒙30篇（4）

2 / 30

已读 0 / 30 课

为什么二维码能容错一部分污损

QR codes use Reed–Solomon error correction, which adds extra data to reconstruct missing parts.
They divide information into modules and encode redundancy so damaged sections can be guessed accurately.
Four levels of error correction exist: L (7%), M (15%), Q (25%), and H (30%)—higher levels mean more resilience.
A scuffed corner or coffee stain may remove up to 30% of modules without breaking the code’s readability.
Scanners detect alignment patterns and timing grids first, then decode the message using mathematical recovery rules.
This built-in redundancy lets QR codes work even when printed on curved or worn surfaces like packaging or posters.
Unlike barcodes, which store data linearly, QR codes hold information in two dimensions—making them far more robust.
Designers choose error level based on expected use: high-risk environments need H-level protection.

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

Designers choose error level based on expected use: high-risk environments need H-level protection. 设计师根据预期使用场景选择纠错等级：高风险环境需采用H级保护。
QR codes use Reed–Solomon error correction, which adds extra data to reconstruct missing parts. 二维码采用里德-所罗门纠错技术，通过添加冗余数据来恢复丢失的部分。
They divide information into modules and encode redundancy so damaged sections can be guessed accurately. 它们将信息划分为模块，并编码冗余信息，以便准确推测受损区域。

这篇中文题目最接近哪一句？为什么二维码能容错一部分污损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？二维码采用里德-所罗门纠错技术，通过添加冗余数据来恢复丢失的部分。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 QR Codes Tolerate Damage How to cook noodles A maths worksheet

Designers choose error level based on expected use: high-risk environments need H-level protection.

Designers choose error level based on expected use: high-risk environments need H-level protection.

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：Designers choose error level based on expected use: high-risk environments need H-level protection.