The triple point of carbon dioxide is about 5 times atmospheric pressure, so liquid carbon dioxide can't naturally exist on Earth.
二氧化碳的三相点高出5倍 大气压,所以没有二氧化碳。
英语百科
Nitrogen dioxide
Nitrogen dioxide is the chemical compound with the formula NO 2. It is one of several nitrogen oxides. NO 2 is an intermediate in the industrial synthesis of nitric acid, millions of tons of which are produced each year. At higher temperatures it is a reddish-brown gas that has a characteristic sharp, biting odor and is a prominent air pollutant. Nitrogen dioxide is a paramagnetic, bent molecule with C2v point group symmetry.