In addition , lapping agent and erodent are kept from contaminating samples during grinding and erosion.能够防止样品在研磨和侵蚀的过程中研磨剂和腐蚀剂的污染.In lapping up a fur, they always put the inner side outwards.卷毛皮时, 他们总是让内层朝外.He was caugh...
He inquired whether there had been any messages for him.他询问是否有留给他的口信。This is actually a very entertaining book putting over serious health messages.这实际上是一本非常有趣的书，讲述了大量的健康知识。We have learnt how to condense serious messages...