The two principal combustion products are water vapor and carbon dioxide.两种主要的燃烧产物是水蒸气和二氧化碳。Mars has an insubstantial atmosphere, consisting almost entirely of carbon dioxide.火星的大气层极其稀薄，几乎全部由二氧化碳构成。Carbon dioxide is a ne...
我所在的公司经历了一段困难时期。The company I work for went through a rough patch.对于两个七十几岁的人来说，这段路太远了。It's a long way to go for two people in their seventies.我们正在经历现代最严重的一段经济衰退。We are in one of the most severe recessions in modern ...