大体而言，使用太阳能或者极低能量放射性同位元素发电机，比如运用于卡西尼任务中的，更加便宜和简单。
By and large, it's cheaper and easier to go with solar power or very low-power radioisotope generators like the one that powers the Cassini mission.
大体而言，使用太阳能或者极低能量放射性同位元素发电机，比如运用于卡西尼任务中的，更加便宜和简单。
By and large, it's cheaper and easier to go with solar power or very low-power radioisotope generators like the one that powers the Cassini mission.
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