粒子世界（14）所有粒子都有反物质吗？塞格雷发现反质子！

Whole-channel inclusion: 妈咪说MommyTalk is an honest teaching channel (title sample + 3 transcripts read: The sampled transcript (video 2) shows in-depth, structured physics explanation despite a news-style hook, consistent with the channel's pattern of genuine science teaching even when framed by current events.); this title passed a strict title check (sonnet) after a labelling pass.

A 17-minute video from 妈咪说MommyTalk: “粒子世界（14）所有粒子都有反物质吗？塞格雷发现反质子！”.

Video by 妈咪说MommyTalk, played through YouTube's embedded player.