It's eight o'clock in the morning, and school had started. The teacher and students were discussing about biology in the classroom. They were going to go for a field trip (外出）to study the environment. The teacher and students were riding bicycles and were talking about all sorts of things, the students were very interested in the discussion. At noon, they arrived at the mountain and started to plant trees there. After having planted the trees, two girls started to pick up the garbages, while picking up the garbage, they said:"Reduce, reuse, and recycle!"
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