为了实现安全着陆小天体，探测器必须具有自主导航、制导和控制的能力。
Probe must have the ability of autonomous GNC to perform landing safely.
对天体物理分析来说，可接收到的天体光量是相当小的。
The amount of light available for astrophysical analysis are usually so small.
对天体物理分析来说，可接收到的天体光量是相当小的。
The amount of light available for astrophysical analysis are usually so small.
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