Like racing cars that swerve and hit each other on a circular track, the moons' speed relative to each other is low because they travel in nearly the same orbit.
这有点像是突然转向的赛车在环形赛道上相撞，月亮们也在同一轨道公转，所以他们之间的相对速度很小。
First is free flow in which the density of traffic is low enough to allow vehicles to travel at the maximum speed allowed.
首先是畅通无阻，交通密度足够低，使得车辆能以最高时速行驶。
The train was invented in the early nineteenth century. It is fast in speed and low in price, especially suitable for the transportation of goods and long-distance passenger travel.
火车诞生于十九世纪初，其特点是快速，廉价，特别适合陆上货物运输以及旅客长途旅行。
Moreover because the low speed travel brings the high oil consumption, the high emissions has directly caused our survival environment worsening.
而且由于低速行驶带来的高油耗，高排放更直接导致了我们生存环境的恶化。
Moreover because the low speed travel brings the high oil consumption, the high emissions has directly caused our survival environment worsening.
而且由于低速行驶带来的高油耗，高排放更直接导致了我们生存环境的恶化。
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