throwaway bio-degradable plastic bags（可降解一次性塑料袋） National Tree-Planting Day（全民义务植树日） fast-growing trees（速生林），lead-free gasoline（无铅汽油） ..
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The National Arbor Day Foundation has challenged many cities to earn its "Tree City USA" flag by planting and protecting more trees.
国家植树节基金会向许多城市发起挑战，要求它们通过种植和保护更多的树木来赢得那面“美国树城”的旗帜。
Check out the NADF (National Arbor Day Foundation) online to find out more about planting a tree in your area or how to volunteer in an urban center.
查看国家植树节基金会网能找到更多有关在你的社区栽棵树或者如何在市中心当志愿者的信息。
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