太阳帆可以像“正方体微型卫星”(CubeSat)任务一样，作为二次有效载荷(secondary payload)被发射升空，家通过这种任务，可以把很多科研仪器送入。
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secondary payload
二次负荷
以上为机器翻译结果，长、整句建议使用 人工翻译 。
But although the Dragon was unaffected, the engine problem left a small communications satellite that was along for the ride as a secondary payload unable to reach its proper orbit.
ECONOMIST: SpaceX goes to the ISS
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