People now wish to preserve traditional architecture like old city walls instead of knocking them down.
人们现在希望保有像古城墙这样的传统建筑，而不是把他们推倒。
She rushed outside in time to see a half-mile wide mud and sand thundering down the hill toward them, knocking over hundreds of trees.
她及时跑了出去，看到半英里宽的泥沙从山上轰隆隆地向他们冲来，撞翻了几百棵树。
Menke says it's a result of knocking down the forests and grasslands and replacing them with whole new environments.
门克说，这是因为人类砍倒森林，推平草原，代之以全新的城市环境。
Menke says it's a result of knocking down the forests and grasslands and replacing them with whole new environments.
门克说，这是因为人类砍倒森林，推平草原，代之以全新的城市环境。
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