One of these comes from making fertilisers, using the Haber-Bosch process which converts nitrogen gas into ammonia.
其中一种是通过将氮气转换成氨气的Haber - Bosch工序来制造肥料。
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Haber-Bosch process(Haber ammonia process, synthetic ammonia process):First economically feasible method of directly synthesizing ammonia from hydrogen gas and atmospheric nitrogen.