... 前后自动进给auto-supplying from front to back 前后快速移动high speed moving from front to back 砂轮grinding wheel ...
基于1个网页-相关网页
前后快速移动
Move quickly forward and backward
以上为机器翻译结果，长、整句建议使用 人工翻译 。
一个哥伦比亚人想要别人靠近他时，他通常会用一个手势，一只手的所有手指都呈杯状，指向下方，同时快速地前后移动。
A Colombian who wants someone to approach him often signals with a hand movement in which all the fingers of one hand, cupped, point downward as they move rapidly back and forth.
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