研制了一种性能优异的易切削铋黄铜来替代有毒的铅黄铜.An environmental friendly Bi - brass with cutting - free and excellent properties was developed to substitute for Pb - brass....
...a top-ranking Saudi officer.最高级别的沙特阿拉伯军官His father, also a top-ranking officer, had perished during the war...他的父亲，也是位高级军官，在战争中牺牲了。Campers should not be related to the chaperon or liaison officer.营员与领队老师或联络官员无亲属关系.The...
These particulate creatures are hardly visible to the naked eyes.这些微小的生物肉眼几乎看不见。Visible particulate matter can be controlled by adequate regulations.对肉眼可见的颗粒物质的污染通过适当管理即可加以控制.Lungs retain relatively insoluble particulate...
Sweet music was being played on the lute.琴韵悠扬.He idly plucked the strings of the lute.他漫不经心地拨弄着鲁特琴的琴弦.The instruments are mainly zhuiqin, two - string Chinese violin, dulcimer, lute and others.伴奏乐器中, 主奏乐器为坠琴,另有二胡 、 扬琴 、 ...