Uranus is an ice giant with a small rocky core and a thick mantle of ammonia, water, and methane.

是一颗冰巨，有一个小岩石内核一层由氨、水甲烷组成的厚厚的地幔。

Today you learned that Uranus and Neptune are ice giants, with small rocky cores, thick mantles of ammonia, water, and methane, and atmospheres that make them look greenish and blue.

今你学到了海是冰巨，有小的岩石内核，有由氨、水甲烷组成的地幔，以及使它们看起来呈绿的大气层。

Radio astronomy was key in establishing  the shape and rotation of the Milky Way, discovering quasars and pulsars, and detecting  organic molecular species like cyanide, ammonia, water and amino acids in  interstellar molecular gas clouds.

射电文学在确定银河系的形状自转、发现类体脉冲，以及探测际分子气体云中的有机分子种类（如氰化物、氨、水氨基酸）方面起到了关键作用。