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Trees should only be pruned (修剪) when there is a good reason for doing so. Many gardeners believe th...

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Because it can make trees grow taller.  Because it can improve the shape of the trees.  Because it can get rid of the small ranches.  Because it can make the small branches thicker.  
Because it can make trees grow taller.  Because it can improve the shape of the trees.  Because it can get rid of the small ranches.  Because it can make the small branches thicker.  
To discuss different methods of pruning.  To introduce some common knowledge of pruning.  To explain how trees develop disease.  To give practical instruction for pruning a tree.  
to helps a wound to dry  to covers a rough surface  damages some of the small side branches  allows too many branches to grow in the middle  
Because it can make trees grow taller.  Because it can improve the shape of the trees.  Because it can get rid of the small ranches.  Because it can make the small branches thicker.  

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