🌍 Daily English: The Flat Revolution: How Metasurfaces Are Redefining the Future of Optics | 2026-04-21
🖼️ Part 1: Daily Quote “A kind word is a boomerang that returns with warmth.” 一句善意的话,是带着温暖飞回的回旋镖。 🔑 Part 2: Vocabulary Builder (10 Words)Here are 10 key words selected from today’s reading on Opt