1. The basic features include a crest (the highest point of the wave),
    它们的基本特征包括浪峰（波浪的最高点）、

2. A trough (the lowest point), a height (the vertical distance from the trough to the crest),
    波谷（最低点）、浪高（从波谷到浪峰的垂直距离）、

3. And a period (which is the time it takes a wave crest to travel one wave length).
    和周期（海峰走过一个波长所需的时间）。