证明了用键参数函数选择变质剂的方法也适用于中铬铸铁的研究。
It is proved that the method of selection modificators by chemical bond parameter is suitable to the study of Cr cast iron.
盐是明显的选择，它很便宜，运输也很方便。它不会变质，并且人人都会食用。
Salt was an obvious choice - it's cheap, it's easy to transport, it doesn't spoil and everyone USES it.
站在超市的走道上，我们没有办法辨别罐头膨胀是由于氢气还是二氧化碳，但也没关系。 假如食品已经变质，告诉商店的经理，然后选择一罐好的就可以了。
Standing in the supermarket aisle, there’s no way you can tell whether a can is swollen because of hydrogen or carbon dioxide gas, but that shouldn’t really matter.
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