These ocean waves are among the earth's most complicated natural phenomena.
be among … 是…之一；包括在…之中
- He was among the last to leave.
- Among those present were the Prime Minister and her husband. 表系主（引起了倒装）
- Among them will be Debbie's mother, who swam the Channel herself when she was a girl.
- Designing a secure system is among the most complicated tasks in software engineering.设计一个安全的系统是软件工程中最复杂的任务之一。
- The structure of the human brain is among the most complicated biological systems known.人类大脑的结构属于已知最复杂的生物系统之一。
The basic features include a crest (the highest point of the wave), a trough (the lowest point), a height (the vertical distance from the trough to the crest), a wave length (the horizontal distance between two wave crests), and a period (which is the time it takes a wave crest to travel one wave length).
crest n. the top or highest point of something such as a hill or a wave 山峰，浪尖
- We reached the crest of the hill just as the sun was setting.我们爬到山顶时，太阳正好落下。
- The crest of the blue heron is particularly prominent during the mating season. 大蓝鹭的羽冠在繁殖季节尤为明显。
- The family crest was engraved on the silver platter. 家族徽章刻在银盘上。
| crest of … …的顶端；…的巅峰 |
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trough n. the hollow area between two waves 波谷/低谷
- The economy is currently in a deep trough, but analysts predict a recovery soon.经济目前处于一个深谷中，但分析师预测很快会复苏。
- Waves are measured from the top (crest) to the bottom (trough). 海浪是从波峰到波谷进行测量的。
- From peak to trough more than 8m jobs were lost. 从峰值跌到低谷造成800万份工作流失。
…, and a period (which is the time(which)it takes a wave crest to travel one wave length). 补全