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张力做了功吗，在环形轨道的例子里，也许法向力做了功？
Is the tension doing any work and in the case of my circular track is, perhaps, the normal force doing any work?
考古学家在一份声明中说，经放射性碳测年法鉴定，环形巨石阵应该建造于公元前2400年至公元前2200年之间，比之前的推测晚了几百年。
The archaeologists said in the statement that radio-carbon dating put the construction of the circle of bluestones at between 2,400 B.C. and 2,200 B.C., a few centuries later than originally thought.
环形子孔径法是一种无需辅助元件就能实现对大口径、大相对口径非球面检测的“柔性”测试技术。
Annular subaperture test method has been developed for low cost and flexible measurement of large, fast aspheric surfaces without any special elements.
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