春天是绿色的，绿色的树木，绿色的草地。

Spring is green, including green trees and green grasses.

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夏天的树叶是绿色的，因为它们富含叶绿素，这种捕捉阳光的分子可以将这些能量转化为新的树木生长材料。

Summer leaves are green because they are full of chlorophyll, the molecule that captures sunlight converts that energy into new building materials for the tree.

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“撒哈拉绿色城墙”是欧盟和非盟正在实施的一个项目，目的是建造一个由树木构成的“绿色城墙”，减少荒漠化，保护萨赫勒-萨哈拉地区的农业和生计。

implementing a project to build a ‘green wall’ of trees across the Sahara

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