名词
中文翻译：一阶方程
同义词：
['first-order system', 'first-order differential equation']
例句：
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1. The first-order equation is a simple model of a system with only one variable.
一阶方程是一个简单的系统模型，该系统只有一个变量。
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2. In the first-order equation, the derivatives are constant and independent of each other.
在一阶方程中，导数是常数且彼此独立。
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3.The first-order equation can be used to describe the behavior of a system when its variables change at different rates.
一阶方程可以用来描述当系统变量以不同速率变化时的行为。