乘飞机旅行的人数将以每年大约6%的速度持续增加。
他们必须专注于以恒定速度持续的自然过程,并且在岩石中留下某种有形的记录。
They would have to concentrate on natural processes that continue at a constant rate and that also leave some sort of tangible record in the rocks.
The fact that you don't need a force for it to move forever at a given speed in a given direction, that's not obvious, because in daily life you don't see that.
对于物体不需要力的作用就能保持,确定的速度和方向持续运动这一事实,它并非显而易见,因为在日常生活中你看不到这种情况
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