这幅画想告诉我们什么？也告诉我们，我们应该提出保护树木和森林。
What does this drawing intend to tell us? That is to tell us that we should put forward on protecting trees and our 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。
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.
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