在读博士怎么翻译成英语啊？

PhD candidate相关例句：1.查德•弗特勒尔是美国康奈尔大学发展社会学专业的在读博士。W. Chad Futrell is a PhD candidate in development sociology at Cornell University in the United States. 2.Miller和柏林技术大学的在读博士生Collin Mulliner同时还发现了黑客轻而易举就可入侵iPhone的一种方法，iPhone被“黑”后，用户将不能拨打电话、上网或发短信。Miller and Collin Mulliner, a Ph.D. student at the Technical University of Berlin, alsodiscovered a method that allow hackers to easily knock a victim's iPhone off a carrier'snetwork.