彗星的准确轨道运动的确定是个复杂而困难的问题，其显著特点是存在非引力效应。

Cometary accurate orbital motion is a complex and difficult problem. Its remarkable characteristic is the presence of the non-gravitational effect.

youdao

彗星的准确轨道运动的确定是个复杂而困难的问题，其显著特点是存在非引力效应。

Cometary accurate orbital motion is a complex and difficult problem. Its remarkable characteristic is the presence of the non-gravitational effect.

youdao