A pass between two mountain peaks or a gap in a ridge. 山口，隘口两个山峰间的通路或者山脊上的裂口
Many mountaineers have reached that mountain peak. 许多登山家都登上过那座大山的顶峰。
The pilot in an airplane equipped with radar, flying at night, can see on the radar viewing screen distant buildings, or perhaps a dangerous mountain peak that is miles ahead. 装备有雷达的飞机，在夜间飞行时飞行员能够在雷达屏幕上看见远处的建筑物、或许还能看见前面几英里远的险峻山峰。
