But it had buoyed to the surface just as the squall sprang up, and with 30-knot winds and four-foot swells that splashed over the stern, it was too dangerous to retrieve the sub.
但潜艇刚刚浮上水面，暴风就凶猛来袭，30节的风速和足有四英尺高的巨浪就扑到了船上。
Analysis of surface stream and energy fields obviously showed that the squall line occurred behind the surface shear line, and before the convergence area of wind.
地面流场和能量场的分析明显反映出了飑线在地面切变线后部，风向、风速辐合区前部。
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