Most young trees have large, deepgreen leaves so that they can catch enough sunlight and change it into their food and energy.
大多数小树都有大大的深绿色叶子,这样它们就能捕捉到足够的阳光,并将其转化为食物和能量。
2
By sucking sap from the young twigs of the hemlock tree, tree growth is retarded by the woolly adelgid, causing needles to change color from deepgreen to grayish green and to drop prematurely.