gradual contraction 截面逐渐缩小 ; 逐渐收缩
All this suggested that America was more likely to endure a gradual, even gentle, slowing of economic growth than a sharp contraction.
所有这一切都表明,美国更可能经历逐步的、甚至是和缓的、减速的经济增长,而非一场剧烈紧缩。
Moreover this gradual contraction inlet may translate some pressure energy of liquid into kinetic energy and increase circumrotate speed. These play active actions on improving separation efficiency.
同时这种渐缩式入口方式,可将来液的一部分压能逐渐转化为动能,提高了旋流速度,对提高分离效率起到积极作用;
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