北美西部晚期的坎帕阶霸王龙的化石记录存在地理差异。
The fossil record of late Campanian tyrannosauroids of western North America has a geographic gap.
我们建立了一套描述聚丁二炔晶体中的三阶非线性光学过程的数学公式。
We derived a set of mathematical formulas for describing the third-order nonlinear optical process in polydiacetylene crystals.
勃朗阶延伸回上新世。
马镫的一阶效应已是非常巨大。
那么二阶导数判定是怎样的呢？
我是说现在已经有两个一阶偏导数。
它就是位置，对时间的一阶导数。
比零阶反应常见得多。
我们先讨论零阶反应。
他们说二阶导数转为正值了。
这是一个零阶反应。
她一步迈四阶楼梯，把自己锁在她的房间里了。
She took the stairs four at a time and locked herself up in her room.
在通常的形式下，这个反应看起来就像零阶反应。
So in the usual formulation, this would still have the appearance of a zero order reaction.
总而言之，我们所做的就是求二阶导数。
一阶反应很常见。
它是位置向量的二阶导。
这意味着如果x变化,函数值不会发生一阶变化。
That means when I vary x the first order the function doesn't change.
零阶反应很少。
它们唯一共同之处就是,它们都被叫作一阶微分算子。
The only thing they have in common is that both are what's called a first order differential operator.
通常，一阶机械特性就能为预测光学性能提供足够的精度。
Often, only first-order mechanical behavior is needed to provide sufficient accuracy in the prediction of optical performance.
这意味着，不管放什么进去，都会包括一阶偏导。
That means it involves the first partial derivatives of whatever you put into it.
三阶吉行是能让你对日本美好明天充满希望的人之一。
YOSHIYUKI SANKAI is one of those people who make you think Japan has a bright future.
这一因素被称为是“二阶导数”，或者是变化率的变化率。
This factor has been dubbed "the second derivative", or the rate of change of the rate of change.
这些教士都60多岁，而且主要是传统教阶制度中的高级教士。
All of these priests were over 60 years of age and represented primarily the higher ranks in the traditional ecclesiastical hierarchy.
矩阵迭代法是求矩阵的第一阶特征值与特征向量的一种数值方法。
Matrix iteration method can be employed to figure out the first eigenvalue and eigenvector of a matrix.
这是一个临界点，考察它的二阶导数,会发现这确实是一个极大值点。
That is a critical point. And we used the second derivative to see that this critical point is a local maximum.
这是一个临界点，考察它的二阶导数,会发现这确实是一个极大值点。
That is a critical point. And we used the second derivative to see that this critical point is a local maximum.
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