这台微波激射器被用来精确测量分子间的微小距离。

The ___maser is used to measure tiny distances between molecules with high precision.

科学家们通过研究来自这颗恒星的微波激射信号，获得了关于宇宙早期演化的重要数据。

Scientists obtained crucial data about early cosmic evolution by studying the microwave signals from this stellar ___maser.