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Low-thrust rendezvous with four asteroid groups (GTOC2)
Design a low-thrust tour that rendezvouses with one asteroid from each of four groups, maximizing final mass per year of flight.
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疑问、子问题和求助。把大问题拆成子 Issue；从任何一个 Issue 都能开出路线。
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Issue 用来放疑问、子问题和求助。