科学家通过观测莱曼阿尔法线来探测早期宇宙中的氢气分布。

Scientists detect hydrogen gas in the early universe by observing the ___Lyman-alpha line.

这片热带雨林是典型的莱曼阿尔法森林，拥有极其丰富的生物多样性。

This tropical rainforest is a typical ___Lyman-alpha forest with exceptionally high biodiversity.