tiān tǐ guāng pǔ xué / de / fā zhǎn / ràng / wǒ men / néng gòu / liǎo jiě / yáo yuǎn / héng xīng / de / huà xué / chéng fèn天体光谱学的发展让我们能够了解遥远恒星的化学成分。The development of astronomical spectroscopy allows us to understand the chemical composition of distant stars.