The ship surged in the stormy seas, rolling and pitching with each wave.
大船在暴风雨的海上随波起伏。
Physically, at a special critical wave speed the flow may have a naturally periodical separated-reattached pattern, with each wave trough capturing a stable vortex ring.
物理上看,在一个特定的临界行波速下会形成自发的周期性分离再附流,每个波谷的分离区捕获一个稳定的涡环。
The cog went up and down, bucking more wildly than any horse he'd ever ridden, lifting with each wave before sliding down into the troughs between, jarring him to the bones.
船上上下下的颠簸,比他骑过的任何马都要剧烈,从浪尖滑入谷底,让他震至骨髓。
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