The causes of tarnishing gold and silver - plated connectors were studied respectively.分别探讨了接插件镀金和镀银层变色的原因.Bright tin electrodeposits on copper wire are susceptible to tarnishing.铜线材经光亮镀锡后易产生腐蚀变色.Do they not realize thei...
Hawks and other rapacious birds prey on variety of small animals.老鹰和其他贪婪的鸟类捕食各种小动物.He had a rapacious appetite for bird's nest soup.他吃燕窝汤吃个没够。...a rapacious exploitation policy.贪婪的剥削政策But Mr Stone is more interested...