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。
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.
这项发表在《公共科学图书馆·综合》上的研究提醒科学家们鼓励社区采取更多措施种植和保护树木。
The study, published in PLOS ONE, has reminded scientists to encourage communities to do more to plant and protect 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 National Arbor Day Foundation has challenged many cities to earn its "Tree City USA" flag by planting and protecting more trees.
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