许多大城市中树木的数量大幅度降低的翻译：Many big cities the number of trees in a significant reduction in 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

Many cities in a significant reduction in the number of trees

Many big cities the number of trees in a significant reduction in

In many big cities trees' quantity reduces large scale

In many large cities substantially reducing the number of trees

Many big cities the number of trees in a significant reduction in