noun 下载 🔗分享 纳米颗粒，纳米粒子 Any microscopic particle less than about 100 nanometers (nm) in diameter. In aerosol science, the term is often reserved for particles less than 50 nm in diameter; the term "ultrafine particles" is used for particles less than 100 nm in diameter. Examples : "Sunscreen contains nanoparticles that help protect your skin from the sun's harmful rays. " 防晒霜含有纳米颗粒，这些颗粒有助于保护你的皮肤免受太阳有害射线的伤害。 material science technology physics chemistry environment 与AI对话词汇游戏阅读练习
