We'll be slicing things by a plane that is now in the direction of this vector,u and we'll be looking at the slope of the slice of the graph.

用沿着向量方向的平面,切开图像,然后看图像的剖面图，找出斜率。

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An American U-2 spy plane captured in the Soviet Union in 1960 had taken off from a secret airbase near Peshawar.

苏联在1960年俘获的一架美国U - 2型侦察机就是从位于白沙瓦附近的一处秘密空军基地起飞的。

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Then the prisoners are seen walking to a U. S. plane.

接着，战俘们走向了一架美国飞机。

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The Air Force uses an array of aircraft, such as the U-2 spy plane, the high-altitude Global Hawk drone or satellites and systems that can gather intelligence from space.

NPR: Military Weighs Cutbacks, Shifts In Drone Programs

Washington (CNN) -- Homeland Security Secretary Janet Napolitano said Tuesday there is a "renewed sense of urgency in the international community" about terrorism after the Christmas Day bombing attempt aboard a U.S.-bound plane, and the U.S. should now push for global security standards for international airports and aircraft.

CNN: STORY HIGHLIGHTS

In this case, the government had information about Umar Farouk Abdulmutallab, but no one added him to either the no-fly list, which would have prevented him from boarding a U.S.-bound plane, or the selectee list, which would have triggered secondary screening that might have caught the explosives hidden under his clothes.

WSJ: The Middle Seat | How to Improve Travel in 2010