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second moment of mass 惯性极矩
The second moment of the least squares estimator in the nonlinear regression model is obtained in this paper in terms of two kinds of curvatures defined by Bates and watts. 本文从似然方程的二级近似出发,求出了非线性回归模型最小二乘估计量(LSE)的二阶矩与Bates and Watts定义的二种曲率之间的关系。
The change of the moment of momentum of a system of particles with respect to the center of mass only involves the external forces acting on the system, not the internal forces. 质点系相对于质心和固定点的动量矩定理，具有完全相似的数学形式，而对于质心以外的其它动点，一般并不存在这种简单的关系。
For large curvature arch, the neutral axis does not pass through the centroidal line of the cross-section, so the moment of inertia is not consistent with the second moment of area. 大曲率拱中,截面形心轴与中性轴不重合,其截面抗弯惯性矩与不考虑曲率影响的截面面积二阶矩有一定的差别;当截面尺寸相对拱弧长来说较大时,此时拱为深拱,剪切变形的影响不能忽略。
It can be used to measure different kinds of the ammunition parameters,such as the center of mass,the centroidal deviation,the moment of inertia,the product of inertia,the dynamic unbalance and etc. 可以用来测量质心位置、质偏、转动惯量、惯性积、动不平衡度等多种参数,同时推导了相应的计算公式,并利用样机进行了实际测量,测量结果表明该方法是有效和可行的,且具有快速、高效、高精度等特点。
A metric unit of mass equal to 100 grams. 百克公制质量单位，等于100克。
After a moment of cranking the motor finally kicked over. 用手柄摇了一阵后，马达终于发动起来了。
When heavy atoms are split in this way some loss of mass occurs. 当重原子这样被分裂的时候，就会发生质量的减少。
She's always to the fore at moments of crisis. 她在危急关头总是挺身而出。
"What else do you see?" asked the captain after a moment of silence. "你还看见什么？"上尉沉默了片刻后又问。
Shrapnel is a weapon of mass destruction. 子母弹是一种大规模杀伤性武器。
He did a foolish thing in a moment of anger. 他在生气时做了一件愚蠢的事情。
Her death was the occasion of mass riots. 她的逝世引发了大规模的骚乱。
The moment of inertia is not a simple concept. 转动惯量不是一个简单的概念。
Saddam had weapons of mass destruction! 萨达姆有大杀伤性武器。
He talked to the press in a moment of indiscretion. 他一时冲动对新闻界发表了讲话。
The Explosion of Mass Advertising and Marketing? 大众广告和市场运做?
But it was only a brief moment of uncertainty. 结果，那也仅是数分钟的迟疑。
The diameter of mass often exceeded 5 cm. 病变直径大于5cm 者多;
He drove away his wife in a moment of anger. 他一气之下将妻子赶出家门。