crash course -------- 速成課(非正式)
英文釋義
(INFORMAL) A short but intensive period of training, usually providing only basic information.
例句
Before traveling abroad as a tourist, I try to take a crash course in the language of the country I will be visiting.
在去國外旅行之前,我想上個速成課,學習我要去的國家的語言。