名词
中文翻译：第
同义词：
['nth order process', 'nth order equation']
例句：
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1.In the chemical reaction, the rate of a second-order reaction is slower than that of a first-order reaction.
在化学反应中，第二阶反应的速度比第一阶反应慢。
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2. The rate of a chemical reaction can be described by an nth order reaction.
化学反应的速度可以用n阶反应来描述。
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3.The nth order reaction model is widely used in chemical engineering to predict the behavior of materials under high pressure.
n阶反应模型在化工工程中被广泛应用，用于预测材料在高压下的行为。