a high-speed high-altitude airstream blowing from west to east near the top of the troposphere; has important effects of the formation of weather fronts
例句
用作名词 (n.)
The stream had become a raging torrent. 小河变成了一条汹涌的急流。
A jet stream is a narrow band of strong winds several kilometres above ground. 高空急流是距离地面数公里高的狭窄强风带。
A separate sole plate heats up the steam even more, producing a more powerful jet. 一个分离的熨斗底板把蒸汽加得更热了,产生了一股更强劲有力的喷射气流。
In both, propulsive force is derived from the reaction produced by a stream of air driven rearwards at high velocity. 这两类发动机都是靠高速向后喷射气流所得到的反作用力而发出推力的。