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。
Researchers say planting and protecting will be needed to make sure cities can develop healthily, but more needs to be done to have a better understanding of city trees which may be different from countryside forests.
研究人员表示，为了确保城市健康发展，种植和保护树木是必要的，但我们还需要做更多的工作来更好地了解城市树木，因为它们可能与乡村森林不同。
For another, we need to enhance our awareness of trees protection and environment protection, and participate in all kinds of activities of planting trees and protecting trees.
另一方面，我们需要提高我们保护树木和环境的意识，并参与到各种种植树木和保护树木的活动。
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