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。
The page will use a Data Tree to display all of the states and cities in a hierarchical view.
此页面将会使用一个 Data Tree 在一个层次视图中显示所有的州和城市。
With its world-famous landmarks such as the Eiffel Tower and the Arc DE Triomphe, and its wide, tree-lined streets, Paris is one of the most beautiful cities in the world.
拥有埃菲尔铁塔和凯旋门这样驰名于世的地标性建筑,以及绿树成荫的宽阔街道,巴黎不愧是世界上最美丽的城市之一。
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