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.
Absent a solution, people like Sue Godfrey will just keep on fighting.假如得不到解决，像休·戈弗雷这样的人就会一直坚持斗争下去。Godfrey's voice broke, and halted.戈弗雷声音都变了，停顿下来。Godfrey had the makings of a successful journalist.戈弗雷具有成为一名成功记者的潜质。...
慢性非特异性溃疡性结肠炎这种病可以恶化亦可缓解.Chronic nonspecific ulcerative colitis is a disease with exacerbations and remissions.溃疡性结肠炎和肉芽肿性结肠炎常侵害儿童和刚成年的年青人.Ulcerative colitis and granulomatous colitis affect many children and young adults...