第一个是积分的对象，称为积分要素。
它的实质是以轨道要素的平均变化率为基础的微分方程，而方程的右端包含定积分。
The essence of this method is a group of differential equations based on the average change rate of orbit elements, and the right sides of these equations contain definite integrals.
核心区内森林景观要素面积较大，但各景观要素之间的面积分配极不均匀，周长也表现出相同的规律。
The forest landscape elements cover a quite large area, nevertheless, the areas of various elements are extremely uneven, and their perimeters demonstrate the same regularity as well.
一阶电路在任意激励下的零状态响应，既可以用卷积积分法，也可以用三要素法进行分析与计算。
The zero state response to an arbitrary excitation in a fist order circuit can be solved by either the convolution integral or the three element method.
一阶电路在任意激励下的零状态响应，既可以用卷积积分法，也可以用三要素法进行分析与计算。
The zero state response to an arbitrary excitation in a fist order circuit can be solved by either the convolution integral or the three element method.
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