如果一个偏序集可以分解成不相交的对称链之并，则称此偏序集具有对称链分解。

A poset is called a symmetric chain decomposition if the poset can be expressed as a disjoint union of symmetric chains.

youdao

在地球化学领域中，直接解决沉积层序和早期成岩时代的定年问题长期以来被证明是具有挑战性的问题之一。

In the field of isotopic geochemistry, direct dating of sedimentary sequences and early-stage diagenesis has long been proved to be one of the challenging problems.

youdao

根据集中参数线路模型算法的实测距离，换算成与模型匹配的正序测量阻抗。

The measured distance of the lump parameter circuit model can be converted to the correspondingly matching positive sequence measured impedance.

youdao

All right, so the bonding order, you're correct, should be 2, if we subtract the number of bonding minus anti-bonding electrons and take that in 1/2.

好，你们是对的，键序为，如果我们用成键数,减去反键数除以2。

麻省理工公开课 - 化学原理课程节选

The way that we can figure this out is using something called bond order, and bond order is equal to 1/2 times the number of bonding electrons, minus the number of anti-bonding electrons.

我们可以用叫做,键序的概念来弄明白它，键序等于1/2乘以成键电子,数目减去反键电子数目。

麻省理工公开课 - 化学原理课程节选

So we know that it's 1, because we have 1, 2, 3, 4 bonding, minus 2 anti-bonding, and 1/2 of that is a bond order of 1.

我们知道它是，因为我们有1，2，3，4个成键，减去2个反键，它的一半就是键序为1。

麻省理工公开课 - 化学原理课程节选