extragalactic造句

例句与造句

1. We shall hardly even touch the captivating problems of modern extragalactic astronomy .
   甚至几乎不涉及现代河外天文学中吸引人的课题。
2. Extragalactic background radiation
   河外背景辐射
3. Extragalactic radio astronomy
   河外射电天文
4. It's difficult to find extragalactic in a sentence. 用extragalactic造句挺难的