These monuments are on major planet ary grid points.
这些纪念碑是行星的主网格点。
It is common for a major planet to retrograde for several months at a time.
不过主行星在一段时间内几次逆行是平常之事。
The sun is the major source of energy for our planet.
太阳是我们星球能量的主要来源。
The sun is the major source of energy for our planet.
太阳是我们星球能量的主要来源。
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