1, recycling: recycling is the process of turning waste into reusable materials. Unlike reuse, reuse only refers to the reuse of one product.

2, tall and straight: straight, straight meaning.

3, tree-lined: describe the dense branches and leaves of trees, blocking the sun.

4, predecessors planted trees, and later generations enjoyed the cool: metaphor for predecessors to benefit future generations.

5. Energy conservation and environmental protection: save energy and protect the environment.

6, tree-lined: dense trees, lush foliage, blocking the sun.