1、The two main mountain ranges in American are the Appalachian mountains and the Rocky mountains.
阿巴拉契亞山脈和落基山脈是美國的兩座大山脈。

2、I am now about to enter Pennsylvania; and the Appalachian mountains lie ahead.
我現(xiàn)在就要進(jìn)入賓夕法尼亞州了，阿巴拉契亞山脈就橫貫在前面。

3、Appalachian Mountains are an important mountain range in eastern North America.
阿巴拉契亞山脈是北美洲東部的主要山脈。