tā / zài / dà xué / zhǔ xiū / tiān tǐ guāng pǔ xué / yán jiū / xīng xì / de / guāng pǔ / tè zhēng他在大学主修天体光谱学,研究星系的光谱特征。He majored in astronomical spectroscopy at university, studying the spectral characteristics of galaxies.