翻译9.He has been studying computer science on and off for five years.
问题描述:
翻译9.He has been studying computer science on and off for five years.
答
他已经断断续续地学了5年计算机技术.
翻译9.He has been studying computer science on and off for five years.
他已经断断续续地学了5年计算机技术.