四元的

By utilizing three benezenemulticarboxylate derivatives (H2chdc, H2aip, NaH2sip), we obtain 12 coordination polymers. Especially, compelexes 1 and 2 are based on one-dimensional ···OHInOHIn···chains as building units, while complex 3 is based on double four-ring [In8(μ2-O)4(μ2-H2O)8]16+, complex 4 is based on trinuclear In3(μ3-O)(CO2)6, complexes 11 and 12 are both based on nested bistranded helices.

选择了三类取代苯羧酸配体： 2，5-二羟基-1，4-对苯二甲酸(2，5-H2chdc)； 5-氨基间苯二甲酸(5-H2aip)； 5-磺酸基间苯二甲酸钠盐(5-NaH2sip)和InCl3反应合成了十二个配位化合物：其中1、2以···OHInOHIn···链为构筑单元， 3以双四元环[In8(μ2-O)4(μ2-H2O)8]16+为构筑单元，4以棱柱状三核铟In3(μ3-O)(CO2)6为构筑单元，而11、12以嵌套的双股螺旋链为构筑单元。

Except for one thing: you don\'t have a good reason to use quaternions yet.

但除了一件事情，你还没有明白为何要使用四元数的原因。

Before discussing why you would want to use quaternions, there\'s one more thing that needs to be explained.

在讨论你为什么要使用四元数之前，还有最后一个需要解决的问题。

You pretty much know all the important stuff about quaternions now.

你现在几乎获得了所有关于四元数的重要信息。

Aim To check and analyze the developmental process from quaternions to vector.

目的考察和分析从四元数到向量的发展历程。

Of course, you\'ll also need to be able to convert from \"conventional\" representations to quaternions.

当然，你可能也会用到四元数转换的&常规&表示法。

However, it was later discovered that quaternions can also be used in computer graphics, as an alternative and compact way to represent rotations.

然而，人们发现四元数也可以应用在计算机图形学上，作为表现旋转的可选择方法之一。

Quaternions are a relative of complex numbers .

四元数是与复数类似的一种数。

The even-product of quaternions is also not widely used, but it mentioned due to the similarity between it and the odd product.

四元数偶积也不常用，但是它也会被提到，因为它和奇积的相似性。

Pairs of unit quaternions can represent a rotation in

单位四元数的对可以表示

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。