The crest of a flood is its highest point, or peak. Flash floods are dangerous because people downstream have no warning of the coming flood.
洪峰是洪水的最高点或顶峰。骤发洪水很危险，因为下游的人们没有得到洪水将至的警告。
Lamp Current Crest Factor: Ratio of peak current to the root mean square lamp Current.
灯管电流峰值因数：峰值电流与灯管电流平方根的比值…
As he reaches the crest of the peak, he unrolls his map, wipes off the lens of his compass, and sees two sets of numbers hanging in the air - wildly fluctuating - as he moves his finger over the map.
他到达了峰顶，打开地图，擦拭他罗盘的表面玻璃，然后看到两串数字悬在半空，在疯狂抖动，因为这时他的手指正在地图上移动。
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