key position的用法和樣例：
例句
- The beautiful plain of Imphal was the key to such a supply corridor, a gateway among the mountain passes.
英帕爾的美麗平原，正是這樣一條供應走廊的樞紐，是山區各條要隘的大門。 - Its position at the heart of Europe has meant that Austria has always been a junction for communications between the continent's main economic and cultural centres.
奧地利處於歐洲心臟的地位意味著它歷來是該大陸各大經濟中心和文化中心的聯絡樞紐。
