题目内容：

这两个英语句子怎么理解
The technique could also be used to trace the thrower of a punch from cells left behind on the skin of their victim. Even the wearing of latex gloves would not help: samll cells can pass through the golves, and the constant flow of genetic material given off by the human body would leave further evidence.
主要是: the constant flow of genetic material 不理解
Dr. Findlay, named scientist of the year in 1998 by the European Society of Human Genetics, said the new testing needed to be scientifically validated, which would take up to five years.
主要是: Dr. Findlay, named scientist of the year in 1998 by the European Society of Human Genetics 不理解