The factory class keeps a static map of the threads that have been connected and can either return the existing connection handle, or create and store the connection handle when called by a thread.
工厂类保留已连接的线程的静态映射，可以在线程进行调用时返回现有连接句柄，或创建并存储连接句柄。
In that case, the second map access would return null and an exception would be thrown.
在这种情况下，第二个映射访问可能会返回null，并抛出一个异常。
Two styles of iterators are supported: iterators that map the filename within the Phar to the name of a file on disk and iterators that return SplFileInfo objects.
支持两种风格的迭代器：一种是将Phar中的文件名映射到磁盘文件的名称，另一种是返回SplFileInfo对象。
They can return to the top level of the map by clicking the beginning of the breadcrumb trail at the top of the page.
他们可以通过单击页面顶部的导航路径记录(breadcrumb trail)来返回这个图的最顶层。
Note that the return value of a get on a Scala Map is not the actual value corresponding to the passed key.
注意，Scalamap中get的返回值实际上并不对应于传递的键。
The interface requires that I pass in an array of the primary keys for which I want full objects, and the DAO implementation will return a Map of the objects.
该接口要求我传入一组主键作为完整的对象，DAO实现将返回对象的Map。
When invoked with a map, keyword functions look themselves up in the map and return their own value.
在通过map调用时，关键字函数将在map中查找自身，并返回自己的值。
At the end of Listing 4, assoc will return and print a new map, but the original map will be unmodified.
在清单4的末尾处，assoc将返回并打印一个新map，但原始map将保持不变。
If he has to return to the same location at a later time, he doesn't need the map, as his spatial area can store the information.
如果他随后不得不回到相同的地点，他不需要地图，因为他的空间能力能够储存信息。
The return structure is also a little different, but you simply map it back to the common structure seen in Listing 3.
返回的结构也有点差异，但您只需将它映射回清单3中的公共结构即可。
Messenger has already been able to return a partial map of the planet's crater-filled surface after just a handful of flybys.
信使号在近距离探测一段时间后就能发回水星那凹凸不平表面的局部地图。
The user clicks the sun or any planet to link to an individual image. To return to the solar system image map, the user clicks the Back button.
用户可以点击太阳或其它星球来单独浏览单个星球的图像，要返回到太阳系图像映射，用户可以单击后退按钮。
The Lunar Reconnaissance Orbiter ( LRO) is scheduled to orbit and better map the Moon, search for buried and hidden ice, and return many high resolution images.
环月球巡逻者（LRO）的任务是围绕月球飞行，绘制更好的月球地图，搜寻掩埋于地下或隐藏在暗处的冰，并发回诸多高分辨率图像。
The Lunar Reconnaissance Orbiter ( LRO) is scheduled to orbit and better map the Moon, search for buried and hidden ice, and return many high resolution images.
环月球巡逻者（LRO）的任务是围绕月球飞行，绘制更好的月球地图，搜寻掩埋于地下或隐藏在暗处的冰，并发回诸多高分辨率图像。
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