名词
中文翻译：第二阶
同义词：
['secondary', 'second-order']
例句：
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1.The second order effect is often overlooked in economic models.
在经济模型中，二级效应往往被忽视。
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2. The second order derivative of the function f(x) = x^2 is f'(x) = 2x.
函数f(x) = x^2的二阶导数是f'(x) = 2x。
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3.In physics, the second order moment of a system is important for understanding its behavior.
在物理学中，系统的二阶矩对于理解其行为至关重要。