“质点”的拼音？

“质点”的英语可以翻译为：mass point，material particle，material point，point particle，particle ...

P点和Q点分别表示该质点的两个位置.Points P and Q represent two positions of the particle.碰撞并不往往使质点减速.Collisions need not always act to slow particles down.我们可标记占据某个小领域的质点群.We label a group of particles occupying a small neighbourhood....