有很多沙粒是红色的，这是由于其表面有一层薄薄的铁，这些铁元素来自于空气中。
Many desert sands have a faint red color caused by a thin layer of iron that precipitates from the atmosphere and coats the grains. (Magnification 85x)
脱氧是加进同氧的亲和力比铁更大的元素来实现的。
Their hemoglobin is both in high content, but also in high oxygen affinity.
应用推荐