To be responsible for the research and development of new products
In charge of the research and development of new products
说明：1）in charge of 的负责更有领头负责的意思,比如你带一帮人,由你负责；而to be responsible 则只是说你负责搞设计,可能你一个人搞.你可根据你的具体情况决定.2)研发实际是研究与开发,所以用两个单词表示,绝对可靠,research and development也可简写为R & D.3）你的提问不是句子,所以上面也只给出短语,要是用在句子中还要做适当变化.比如I was responsible for the design of……from 2006－2007