基本解釋[數(shù)學(xué)]粒子位置向量英漢例句雙語例句Angular momentum: The vector product of the position vector (from a reference point) and the linear momentum of a particle.角動量：（有參照點）的矢量和粒子線性動量的向量積。particle position vector更多例句專業(yè)釋義數(shù)學(xué)粒子位置向量