The answer here is orbit, which usually follows a curved track around something in space.
答案是orbit，它通常指太空中围绕着某物的弯曲的路径。
Curved track
原声例句
当月 CNN 10 学生英语 2020年10月合集
B1M建筑科普
The arch's solution operates more like a vertical tramway, with visitors entering one of eight horizontal compartments which proceed up one leg of the arch along curved tracks.
拱门的解决方案更像是垂直的缆车，游客可以进入八个水平分隔厢中的一个，沿着弧形轨道沿着拱门的一条腿向上走。
4.哈利波特与火焰杯
Horrified, transfixed, Frank stared as its undulating body cut a wide, curving track through the thick dust on the floor, coming closer and closer -- What was he to do?
弗兰克吓得呆若木鸡，站在那里望着它波浪般起伏的身体，在地板上厚厚的灰尘中留下蜿蜒曲折的、宽宽的轨迹，慢慢地越来越近--他怎么办呢？
英语百科
Track geometry
Track geometry is three-dimensional geometry of track layouts and associated measurements used in design, construction and maintenance of railroad tracks. The subject is used in the context of standards, speed limits and other regulations in the areas of track gauge, alignment, elevation, curvature and track surface. Although, the geometry of the tracks is three-dimensional by nature, the standards are usually expressed in two separate layouts for horizontal and vertical.
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