Time factor, the factor of money, lead to the people of the country to read more and less.

时间的因素、金钱的因素，导致现在的国人读书越来越少。

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After the siderite is fully decomposed, oxidation degree will be the main factor influencing the roasting effect and a roasting time increase would lead to a reduced product quality.

在菱铁矿完全分解之后，氧化程度是焙烧效果的主要影响因素，延长焙烧时间会使焙烧产品质量下降。

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After the siderite is fully decomposed, oxidation degree will be the main factor influencing the roasting effect and a roasting time increase would lead to a reduced product quality.

在菱铁矿完全分解之后，氧化程度是焙烧效果的主要影响因素，延长焙烧时间会使焙烧产品质量下降。

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