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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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