他们都穿着田径服，似乎想掩饰他们的真实职能。They were decked out in tracksuits, seemingly to dissimulate their true function.做田径服需要用弹性强的料子.For tracksuits you need material with plenty of stretch.费尔南德斯说卡斯特罗穿着田径服,这衣服从他生病以后已经成为他的标志性服装了.Fernandez...
Welding is one of the important technologies in impellers " artifactitious . "焊接是 叶轮 加工的重要工艺之一.The welding conditions should always be neutral or slightly oxidizing.焊接气氛必须永远保持中性或微氧化.The welding is so smooth that you can ...