bone up
phrasal verb with bone verb uk/bəʊn/ us/boʊn/
informal
苦学，专心致志地学
to learn as much as you can about something for a special reason
She boned up on economics before applying for the job. 申请工作前她刻苦攻读了经济学。
江苏热线英汉汉英双解词典包含207361条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。