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

王是一颗冰巨，有一个岩石内核和一层由氨、水和甲烷组成厚厚。

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.

今你学到了王和海王是冰巨，有岩石内核，有由氨、水和甲烷组成，以及使它们看起来呈绿色和蓝色大气层。

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形状和自转、发现类体和脉冲，以及探测际分子气体云中有机分子种类（如氰化物、氨、水和氨基酸）方面起到了关键作用。