As mentioned earlier, one of the applications of the integral is the calculationofarea. Ordinarily, we do not talk about area by itself, instead, we talk about the area of something.
就像前面提到的，积分的一个应用就是面积的计算，通常我们不讨论面积本身，相反，是讨论某事物的面积。
2
To introduce the basis of selecting section area in mechanical property calculationof steel wire for bridge cable.
介绍桥梁缆索用镀锌钢丝力学性能计算中选择截面积的依据。
3
The technology of grinding ball by centrifugal casting, the rotational speed, the method for calculationof ingate area and factors influencing technological process were introduced.