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发表于 2009-6-10 13:41:20
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When you look at a tree, you just see half of it, since the other half grows under ground, that is, the root.
Many of the peoples believe that the roots grow down, although most of them grow all around. They can spread around through thick earth as far as the tree grows up.
The roots absorb water and mineral matters from earth, and transport them up to the trunk and branches. |
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