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....
We expect politicians to defame each other in an election year.我们预料政客们在选举年会互相诽谤.To attack the character or reputation of; speak ill of; defame.攻击人格或名誉; 说坏话; 诽谤.Their attempt to defame China will get nowhere.这些人利用谣言抹黑中国的企...