平行四边形

zhè ge shí yàn zhèng míng le píng xíng sì biān xíng yù shang qū miàn jù yǒu bǎo tū xìng

这个实验证明了平行四边形域上W曲面具有保凸性。

This experiment proves the W-surface on the parallelogram have the convexity-preserving.

chē liàng yī dàn jīng guò lù kǒu shí fā shēng guǎi wān nà me hòu xù shù jù diǎn dào dào lù de tóu yǐng zé cǎi yòng píng xíng sì biān xíng tóu yǐng

车辆一旦经过路口时发生拐弯，那么后续GPS数据点到道路的投影则采用平行四边形投影。

Once a vehicle turns when passing an intersection, the subsequent projection of GPS data points onto the road adopts parallelogram projection.