According to the task, must design a standard return trajectory which is reference trajectory for guidance when a manned spacecraft returns.

载人航天器返回时，根据任务的要求，需要设计一条标准返回轨道，作为制导时的参考轨道。

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According to the task, must design a standard return trajectory which is reference trajectory for guidance when a manned spacecraft returns.

载人航天器返回时，根据任务的要求，需要设计一条标准返回轨道，作为制导时的参考轨道。

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