通过将星际气体分部绘制成地图，我们填补了关于银河系知识的主要空白，Welsh说。

By mapping this gas, Welsh said we were filling in major blanks in our knowledge about the galaxy.

youdao

通过将星际气体分部绘制成地图，我们填补了关于银河系知识的主要空白，Welsh说。

By mapping this gas, Welsh said we were filling in major blanks in our knowledge about the galaxy.

youdao