红外光谱 Traditional 紅外光譜 hóng wài guāng pǔ 🔊 infrared spectrum + Keep this word Meanings hóng wài guāng pǔ 紅外光譜 infrared spectrum Its characters 红hóngredHSK 5外wàioutsideHSK 1光guānglight; ray (CL:道[dao4])HSK 4谱pǔchartHSK 7–9