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We have seasons because of the way the Earth spins round, or orbits, the Sun. Each orbit takes a year from start to finish. the Earth is tilted, and as the planet orbits, first one Pole and then the other leans towards the Sun. This is what gives us the seasons.
1. season：季节
2. orbit：绕轨道运行
3. tilted：倾斜的
4. lean towards：倾向（偏向）
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