The covers of these magazines are printed with superior copperplate paper.这些杂志的封面都是用上好的铜版纸印刷的.With plenty of experiments, the parameters of copperplate friction stir welding are optimized.通过大量试验分析, 优化了铜板搅拌摩擦焊接工艺.The unpr...
他们赤着脚, 光着背,汗水不断地从脸上流下.He, aw - ah , oh . They are barefoot and naked to the waist.天气已经暖和,他赤着脚光着上身干活.It was already warm and he worked barefooted and stripped to the waist....