这场变革已让一些世界上最大的科技公司不得不重新设计他们的手机，而且证明了只要有条件，用户会用他们的手机做比打电话和发信息多得多的事情。
It has sent some of the largest technology companies in the world back to the drawing board and proved that, given the opportunity, people will do far more with a phone than make calls and send texts.
受水平井客观条件的影响，水平段的套管扶正问题，水平井的水泥浆体系设计问题，都是水平井固井的最大难点，也是影响水平井固井最关键的因素。
Influenced by the objective condition, the problems such as the casing centralizing, design of cement slurry system are the maximum difficulties and also the key factors.
同时，也给出了取得该最大制冷量所需的设计条件。
While a general expression for maximum cooling rate is obtained, the design conditions required to achieve it are also determined.
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