他们已开始拆除建筑物。
拆除建筑物会产生大量的废弃混凝土块，既带来环境污染，又造成资源浪费。
Removing the building will produce a large number of discarded concrete lump, not only bring the environmental pollution but also cause resources to waste.
说到拆除建筑物，有两个基本方法：只拆除不进行材料分离，选择性逆向建筑施工拆除。
When it comes to demolishing buildings, there are two basic approaches: demolition without material separation, and selective reverse construction.
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