数据库可以为每个节点分配顺序号，这样就知道每个节点的位置，可以在常数时间内比较两个节点的文档顺序。
The database can assign sequence Numbers to each node so that it knows the position of each node and can compare the document order of two nodes in constant time.
我来把更一般的形式，写出来吧，在一维空间中，位置和速度，作为时间函数的，一般形式，这里的加速度是一个常数。
I now would like to write down, in most general form the equation for the position and the velocity as a function of time for a one-dimensional motion whereby the acceleration is constant.
爱因斯坦认为存在一个宇宙常数来填补现在暗能量的位置。
Einstein proposed the existence of something he called the cosmological constant, to fulfil the role now assigned to dark energy.
为了确定在任一给出的位置的alpha常数的强度，科学家们测量了不同原子的电子从一个能级跃迁到另一能级的频率。
To determine how strong the alpha constant was in any given spot, the scientists measured the frequency at which electrons in various atoms would hop from one energy level to the next.
这不是个常数，因为你的旋转依赖于你所处位置。
It is not just a constant because how much you rotate depends on where you are.
通常数据来自企业的LDAP目录，但是还需从其他位置(如公司的HR数据库)提取一些数据。
Usually this is the organization's LDAP directory, although it may be necessary to extract some of this data from other locations such as the company's HR database.
研究人员总结说，既然如果alpha常数随时间变化的话，这两种结果就会自相矛盾，那么该常数就必然在宇宙中不同的位置存在不同的值。
Since those two results would contradict each other if the alpha constant varied with time, the constant must take on different values in different areas of the universe, the researchers concluded.
参考星：已知位置和/或星等的恒星，用于确定图片的底片常数和光度校准。
Reference Stars: Star with known position and/or magnitude, that are used to find the plate constants and photometric calibration of an image.
一定条件下该硝化剂具有较好的反应位置选择性，这一是由于反应介质低的介电常数，二是多孔载体也具有明显的作用。
In this system good regioselectivity can be achieved mainly because of the existence of a porous support and the low dielectric constant of the reaction media.
其蜗形部分不采用速度矩为常数的假设，固定导叶的形状沿圆周是变化的，以便与来流相适应；固定导叶与活动导叶两环列叶栅之间的相对位置是由优化计算确定的。
The hypothesis of constant velocity moment was not used for the spiral parts design, and the shapes of stay vanes are different along the circumference so that they can adapt their...
其蜗形部分不采用速度矩为常数的假设，固定导叶的形状沿圆周是变化的，以便与来流相适应；固定导叶与活动导叶两环列叶栅之间的相对位置是由优化计算确定的。
The hypothesis of constant velocity moment was not used for the spiral parts design, and the shapes of stay vanes are different along the circumference so that they can adapt their...
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