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In autumn, trees find it difficult to suck up water from the cold, frozen ground, so their leaves dry out. The leaves turn red, gold and brown and fall to the ground, leaving the trees bare for winter. The trees will grow new leaves in the spring.
1. autumn：秋天
2. suck up：吸收
3. dry out：使…干硬
4. bare：(树或树枝) 没有树叶的
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