crash course
noun [ C ] uk/ˈkræʃ ˌkɔːs/ us/ˈkræʃ ˌkɔːrs/
速成班;短训班;速成教程
a course that teaches you a lot of basic facts in a very short time
I did/took a crash course in French before my trip to Paris. 我去巴黎前参加了一个法语速成班。
英汉双解词典收录81607条英汉双解翻译词条，基本涵盖了全部常用单词的读音、翻译及用法，是英语学习的有利工具。