This is a region of very flat ground extending from the Canadian border to the Gulf of Mexico,and eastward as far as the
问题描述：
This is a region of very flat ground extending from the Canadian border to the Gulf of Mexico,and eastward as far as the Appalachian Mountains.
这里的as far as
和什么什么一样远?就什么什么而言?
答
这是一个地区非常平坦的土地延伸至加拿大边境的墨西哥湾,东到阿巴拉契亚山脉.
as far as指远到...直到...