Through analysis and tests, the authors selected corrosion resistant nitrogen case-hardening process to replace chrome plating.

通过分析和试验，我们采用了抗蚀渗氮取代电镀铬工艺。

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Farmers think that using more nitrogen and potassium fertiliser will produce higher yields and this only leads to problems such as water pollution and hardening of the soil.

农民以为施用了更多的氮肥钾肥就可以得到更高的产量，这才带来了水体的污染、土壤的板结等问题。

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