Drag of the train head is obtained by the method of surface integral and drag coefficient can be computed at the same time.

通过表面积分的方法得到各种列车车头的阻力，进而计算得到了车头模型的阻力系数。

youdao

It is an integral, plural, open and flexible system intended to train youth, adults and their communities.

UNESCO: Country Profile: Cape Verde