On top of that is the shell SWF, which contains all of the constant site elements, such as navigation, footers, etc.
核心层之上是shellSWF，这里包含了所有通用的网站元素，诸如导航栏、脚注等等。
Gerardus Mercator's projection, published in 1569, was immediately useful because it depicts a line of constant bearing as a straight line, which is handy for Marine navigation.
福西厄斯•墨卡托的投影于1569年问世，马上就派上了用场，因为它把不变的方位描绘为直线，这对航海非常方便。
A zipper is a way of representing a data structure with a local context, such that navigation (iteration) and modification from the current context are, for the most part, constant-time.
zippers是使用本地上下文表示数据结构的一种方法，这使当前上下文中的导航(迭代)和修改在很大程度上具有常量时间的特点。
For example, the Mercator projection is widely used by boats and ships because it produces a map in which lines of constant bearing are a straight line, which greatly simplifies navigation.
例如，墨卡托投影是广泛使用艘舟艇，因为它产生的地图中，不断轴承线一条直线，从而大大简化了导航。
Using astronavigation theory, the algorithm of calibrating the constant gyro drifts of ESG strapdown inertial navigation system and carrier heading is presented in this paper.
本文应用天文导航理论，根据GPS提供的位置信息，对静电陀螺捷联导航系统陀螺常值漂移和载体航向角进行校正的算法进行了研究。
Using astronavigation theory, the algorithm of calibrating the constant gyro drifts of ESG strapdown inertial navigation system and carrier heading is presented in this paper.
本文应用天文导航理论，根据GPS提供的位置信息，对静电陀螺捷联导航系统陀螺常值漂移和载体航向角进行校正的算法进行了研究。
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