甘比英文拓展写作-Anatomy of oak

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The oak trees are tall. The roots grow underway to form a system to absorb water and nutrients, with xylem transporting from the rest and the phloem from the leaves. The strong trunk is straight upward, with branches widen on the top of the trees. On the branches there are beautiful leaves arranged, one half to a stem, on alternating sides of the twig. All oak trees are usually in full bloom by the time April arrives. In summer, the rest of the tree uses the sugars it produces. In fall, the leaves produce full colors of red, orange, and bronze. In winter, the yellow leaves fall away. Oak trees don't start blooming and producing acorns until they are around 20 years of age. The acorns have dark stripes along their length. Their caps have flat scales. A hard seed doesn't split open until maturity. Some species test seeds, others are bitter. The oak trees are valued for their wood, appearance, fruit and so on. Since the average age can be 600 years (live an age of 600 years), the oak trees are made good used by human beings and wild animals for materials of construct building, ships, furniture, new energy and so on.