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重点讲解：
1. solar system 太阳系
Saturn is the second biggest planet in the solar system.
土星是太阳系的第二大的行星。
2. push into 推进；推动
The firm has begun a major push into the European market.
这家公司已展开了对欧洲市场的重要攻势。
3. look back 回顾；回头看
I will look back at this one with undiluted pleasure
回顾此事，我会无比地开心。
4. take time to do 花时间做某事
It takes time and patience to photograph wildlife.
拍摄野生动物要肯花时间，要有毅力。
