Non-linear equations are(constructed) with the restriction of the satellite ground trace to resolve the unknown semi-axis and inclination, but it's too complicated to be resolved directly.

以轨道半径和轨道倾角为未知量依据星下点轨迹要求条件构建了非线性方程组，但直接求解过于复杂，采取迭代的方法解决。

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The method of designing special elliptic orbit which was critical inclined, sun synchronous and repeating ground trace was expounded, and the calculation process of this method was summarized.

阐述了临界倾角太阳同步回归轨道这种特殊椭圆轨道的设计方法，总结了其轨道要素的计算步骤。

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We stared together at the ground as if to trace the footprint buried under the cement.

我们盯着地面，好象要挖掘出埋葬在水泥地面下的足迹。

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The U.S. also would try to impose greater measures of accountability to "trace the investment and the payoff for the American taxpayers and for the people on the ground, " she said.

CNN: Clinton doesn't rule out Iran talks at Afghanistan conference