n.剧烈增加；脉冲修尖
动词peak的现在分词形式.
The mountain peaks are covered with snow all year. 山顶上终年积雪。
We have a precipitous climb to the peak. 我们向着陡峭山顶攀登。
Tourism is at its peak in August. 旅游业在八月份达到高峰。
The business cycle is a series of peaks and troughs. 商业周期就是淡旺期交替。
adj.说本族语的；讲本国话的
v.证明（某事物）；表示；预示
