光合作用的生物在还原空气里的二氧化碳的同时也消耗氧气。
While photosynthetic life reduced the carbon dioxide content of the atmosphere, it also started to produce oxygen.
在无任何外加溶剂及共还原剂的条件下，应用此高分子金属卟啉作为催化剂，选择性地催化空气氧化环己烷为环己酮和环己醇。
This macromolecular metalloporphyrin was used as the catalyst for the first time for cyclohexane oxidation to cyclohexanol and cyclohexanone with air in the absence of additives or solvents.
尽管惰性气氛和还原气氛下焙烧样品有利于四方相的稳定，但样品暴露于空气中后，表面四方相较易转变为单斜相。
But the tetragonal phase in the surface region transforms easily to monoclinic phase when the samples are exposed to air.
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