Be like a trace still not take out, can twist a cotton cloth after the dip in Wenshui dry, inunction of on drop a few ammonia water, use glazing candle polish finally.
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.
结晶性粉末，在空气中易风化，微溶于水，溶于碱和
水。
，
上几
石内核和一层由
和甲
成的厚厚的地幔。
、
、
和氢
成——不存在游离氧。
