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。

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Some people think trees should be planted on Tree Planting Day only.

有些人认为应该只在植树节种树。

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They were famously planting the trees in Athens the day before the opening ceremony, but the landscaping on the Olympic Park is starting to take shape.

在雅典奥运会开幕式前一天，人们正在那里种下树木，但这里奥林匹克公园的风貌才刚刚开始成形。

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Scores of people were armed on a cold spring day with shovels, not guns, and were busy planting trees as part of a forestation campaign.

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