由于没有引擎在工作，“航行者”迅速开始失去速度和高度。
With neither engine working, Voyager quickly began to lose speed and height.
飞机在白天利用太阳能爬升到较高的高度，然后利用高度把势能转换成飞行速度，给电池组充电，用来维持夜晚的航行。
The plan is to climb to higher altitudes during the day, and trade that altitude for airspeed, supplemented with battery power, to continue flying during the night.
摇摆龙骨的优点在于，当龙骨升起时，船只能在浅水航行，并减低在拖车上的高度。
The advantage of a swing keel is that, with the keel raised, the sailboat can go into shallow water and sits lower on a trailer.
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