很久前他们就开始拆掉这栋危险建筑的翻译：For a long time ago they began to tear down this dangerous building 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

Long before they began to tear down this building dangerous building on

For a long time ago they began to tear down this dangerous building

正在翻译，请等待...

A long time ago when they started demolishing the houses dangerous building

For a long time ago they began to tear down this dangerous building