It is a general designation for the previously triangulation, trilateration survey and triangulateration.
它是对已往三角测量、三边测量和边角网测量
统称。
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年考研英语阅读选择真题(英语一)
年六级听力真题精听 In the case of Facebook, the company says data may hang around until the URL in question is reused, which is usually " after a short period of time." Though obviously that time can vary considerably.
在脸谱
的案例中,该公司表示相关数据可能以缓存的形式保留,直到URL地址被重新打开才会显示出来,这种情况通常发生在发出删

后的短期内。但显然,公司在对这段时间的描述上与实际情况有很大的误差。
年六级听力真题精听 The problem relates to the way data is stored on large websites: While your personal computer only keeps one copy of a file, large-scale services like Facebook rely on what are called " content delivery networks " to manage data and distribution.
你的个人电脑里只保留了文件的一个副本,像脸谱
这样的大型服务器会通过内容分发
络来对数据进行管理和分配。