地层的一些分应力可以直接测量，而且其它的可以从已知数推导，但是一些必须根据相互关系而估计。

Some stress components in a formation can be measured directly, and others can be derived from known quantities, but some must be estimated based on correlations.

youdao

本文推导两个成份的光学猫态的平均光于数，二阶相干度的表达式及猫态的光子数分布，揭示出猫态的某些性质。

The mean photon number, the second-order coherence and the distribution of this optical cat state are derived in this paper and some properties of this state are presented.

youdao

对低马赫数叶轮离散噪声的机理及计算方法进行了研究，并推导了离散噪声的声压计算式、低马赫数下近似计算式和轴心线上的计算式，还实验验证了计算模型。

Research is carried out on the discrete noise theory and calculation method, the calculation model of discrete noise and the approximate formula under small Mach number are verified by experiments.

youdao

In this case, V = /P. Have two quantities and the number of moles gives you another property. You don't need to know the volume. All you need to know is the pressure and temperature and the number of moles to get the volume.

以及气体的摩尔数,就可以得到第三个量,知道压强，温度和气体的,摩尔数就可以推导出气体的体积,这称为状态方程,它建立了状态函数之间的联系。

麻省理工公开课 - 热力学与动力学课程节选

So now, this equation here relates three state functions together: the pressure the volume, and the temperature. Now, if you remember, we said that if you had a substance, if you knew the number of moles and two properties, you knew everything about the gas.

压强，体积和温度,大家应该还记得,我们提过，只要知道气体的摩尔数,和任意两个状态函数,就可以推导出其他的状态函数，这样，我们可以把它改写成。

麻省理工公开课 - 热力学与动力学课程节选