用英文翻译一下句子，急！！
- 培训职业
- 2025-05-17 07:15:40
1/The solar system is the one of many galaxies in the universe.
2/There are mercury, the earth, Mars and Saturn, etc in the solar system .
3/The astronauts had already detected some planet, but not found signs of life.
4/The earth is the only homeland we live in,so we should protect it carefully.
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