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The reason of 7:3 collocation of trees and shrubs
The reason is to adhere to the principle of giving priority to trees, accompanying flowers and trees, optimizing varieties and plants, and coordinating harmoniously.

China has a large population density, limited green space and limited water resources. Adhere to the principle of giving priority to trees, accompanying flowers and trees, optimizing varieties and plants, and coordinating harmoniously, so that the city has good greening and protection effects all year round.

Arbor refers to a tall tree with an independent trunk from the root, and the trunk and crown are clearly distinguished. Woody plants with upright trunks, usually up to six to tens of meters high, are called trees.