在这个高度，听着，在保持这个速度，整个飞机空着的情况下，那飞行员说还剩六到七个小时的燃油。
And at this altitude, listen, and at this speed, with the plane empty, the pilot says there are six or maybe seven hours of fuel left.
他自己也不知道是什么原故，只要他保持离水面不到半翅的高度作低空飞行，他就能在空中停留较久，费劲较小。
He didn't know why, for instance, but when he flew at altitudes less than half his wingspan above the water, he could stay in the air longer, with less effort.
构建了波音737 - 300飞行模拟机的高度保持系统。
An altitude maintenance system was built up for B737-300 full flight simulator.
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