考研用英语可以翻译为以下几种方式：

graduate student entrance examination

Postgraduate Entrance Examination

take part in the postgraduate entrance examination

take the postgraduate entrance examination

take the graduate school entrance examination

这些表达都准确地描述了考研这一概念，可以根据具体的语境选择合适的表达方式。例如，在正式文件或考试中，使用 "Postgraduate Entrance Examination" 更为常见；在口语交流或写作中，"take part in the postgraduate entrance examination" 可能更为自然。