It could force new space tools to travel at slower speeds.
它可能会迫使新的太空工具以更慢的速度运行。
Under the control of the Sun's gravitational force, each planet maintains an elliptical orbit and all of them travel in the same direction.
在太阳引力的控制下,每个行星都维持在一条椭圆形的轨道上,并按照相同的方向移动。
The real force behind European integration is easy travel, especially when it’s cheap.
欧洲一体化真正的力量是可以随意去旅行,特别是当旅行非常便宜的时候。
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