$课文40 海浪

743. Waves are the children of the struggle between ocean and atmosphere, the ongoing signatures of infinity.

海浪是大海和空气相斗的产物，无限的一种不间断的标志。

744. Rays from the sun excite and energize the atmosphere of the earth, awakening it to flow, to movement, to rhythm, to life.

太阳光刺激了地球的大气层，并给予它能量；阳光使空气开始流动，产生节奏，获得生命。

745. The wind then speaks the message of the sun to the sea and the sea transmits it on through waves -- an ancient, exquisite, powerful message.

然后，风把太阳的住处带给了大海，海洋用波浪的形式传递这个信息 -- 一个源过流长、高雅而有力的信息。

746. These ocean waves are among the earth’s most complicated natural phenomena.

这些海浪属于地球上最复杂的自然现象。

747. 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）、

748. 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）、

749. a wave length (the horizontal distance between two wave crests),

波长（两个浪峰间的水平距离）

750. 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）。