【對焦中英翻譯】惡補的英文到底怎麼說？

惡補的英文到底怎麼說？
A .名詞
cram-coaching

他不用找顧問幫他惡補就能通過這些測驗。He will pass these tests without ~ from his advisers.


B. 動詞
1. bone up
為了參加下個月的導遊考試，他一直在惡補日語。He has been boning up on Japanese conversation for next month’s tour guide test. 

惡補選戰議題 boning up on campaign issues

 
2. take a crash course
我得惡補一下中國話才行。I had to ~ in Mandarin.

 
3. undergo a crash course
其他人惡補時事以期在機智問答時有良好的表現。Others ~ in current events to help them make intelligent conversation.