由北向南乘火车的好处之一是太阳好像总是伴随着路轨，它的行走轨迹像一道凯旋的拱门。
One of the best things about riding a north-south route is that the sun bounds over the tracks in a triumphal arch.
集矿作业车控制主要为对作业车行走速度、行走方向、行走轨迹和工作机构状态的控制；
The control on the deepsea tractor focuses on its velocity, orientation-path clearance and collecting performance.
每天按照固定的轨迹行走，然后逾越过一些坎坷，继续再向前走。
A day according to a fixed track to walk, and then overcome some rough and continue to move forward again.
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