N a reverse movement of air, gas, or liquid (气、液、固体的)逆向运动
But the little mermaid had no occasion to do this, for the polypi sprang back in terror when they caught sight of the glittering draught, which shone in her hand like a twinkling star.
可是小人鱼没有这样做的必要，固为当珊瑚虫一看到这亮晶晶的药水——它在她的手里亮得像一颗闪耀的星星——的时候，它们就在她面前惶恐地缩回去了。
The paper describes the practice of put into operation for up-draught gas back sintering machines; introduces technical parameters determined and production control and solve measures for problems.
叙述了鼓风返烟烧结机的投产实践，介绍了工艺参数的确定，生产过程的控制，出现的问题及解决措施。
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