英语语法分析

But the research so far has been extremely promising, " says Dr. Ellen Vitetta, director of the Cancer Immunobiology Center at the University of Texas Southwestern Medical Center at Dallas."

但是位于达拉斯的得克萨斯大学西南医学中心的癌症免疫生物中心主任艾伦·维提塔医生说：“研究到目前为止非常有前景。”