英语语法分析

Astronomers know that Pluto and Triton have nearly the same size, mass, and density.

天文学家们知道冥王星和海王卫一拥有几乎相同的体积、质量和密度。

《柯林斯英汉双解大词典》

First of all, astronomers look for a star.

首先，天文学家要寻找一颗恒星。

Particle physicists and astronomers collaborate often.

粒子物理学家和天文学家经常合作。