Such paths correspond to Bohr's allowed orbits.

这样的路径对应于玻尔的允许轨道。

Moreover, the idea of a limited set of allowed orbits seemed very arbitrary.

此外，一组有限的允许轨道的想法似乎非常武断。

These allowed its orbit before its encounter with Earth to be calculated with precision.

这些使得它在与地球相遇之前的轨道得以精确计算。