That means that if you draw parallel lines in space, then they will remain the same distance apart along their infinite lengths instead of converging or diverging.
这意味着如果你在空间中作两条平行线，它们不会聚合或离散，只会一直保持相等的距离无限延伸下去。
From the front, the forelegs move in almost parallel lines, converging slightly as the speed increases.
从前面观察，前腿差不多在平行的线上运动。随着速度增加，会略微收拢。
From the rear, the legs move in almost parallel lines and in the same line of motion as the forelegs, converging slightly as the speed increases.
从后面观察，后腿差不多在平行的线上运动(与前腿相同的线)，随着速度增加，会略微收拢。
From the rear, the legs move in almost parallel lines and in the same line of motion as the forelegs, converging slightly as the speed increases.
从后面观察，后腿差不多在平行的线上运动(与前腿相同的线)，随着速度增加，会略微收拢。
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