本文研究表明，上述影响因素的二阶经向变率的存在条件对于“大圆路径”形成起了重要作用。
The analysis indicates that the conditions of second derivative of the above relevant factors play an important role in the formation of great circle route.
本文研究表明，上述影响因素的二阶经向变率的存在条件对于“大圆路径”形成起了重要作用。
The analysis indicates that the conditions of second derivative of the above relevant factors play an important role in the formation of great circle route.
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