a crash course in sth
指短期内集中强化的培训，后面常用 in 引出所学内容。
She took a crash course in Spanish before moving to Madrid.
她在搬到马德里之前上了一门西班牙语速成课程。
快速、迅速、密集、即兴的。；速成的；[计] 崩溃
fast, intensive, and done in a short time, often without much preparation
多用于 crash course（速成课程）、crash diet（快速减肥）等搭配，强调短时间内集中完成。
快速、迅速、密集、即兴的。
Quick, fast, intensive, impromptu.
I signed up for a crash course in cooking before I moved into my own apartment.
我在搬进自己的公寓前报了一个烹饪速成班。
用法提示：crash 作形容词修饰 course，表示课程是速成、密集的。
The team did a crash review of the plan before sending it to the client.
团队在把计划发给客户前做了一次突击审查。
用法提示：crash 作形容词修饰 review，表示审查是快速、密集进行的。
He went on a crash diet to lose weight before the wedding.
为了在婚礼前减重，他进行了一次快速节食。
用法提示：crash 作形容词修饰 diet，表示节食是快速、密集的。
指短期内集中强化的培训，后面常用 in 引出所学内容。
She took a crash course in Spanish before moving to Madrid.
她在搬到马德里之前上了一门西班牙语速成课程。
指为了快速见效而采取的极端节食法，crash 在此作定语修饰 diet。
He lost five kilos on a crash diet before the wedding.
他在婚礼前靠快速减肥瘦了五公斤。
多用于英式英语，表示时间紧、推进快的应急计划，后接 to do sth 说明目的。
The city launched a crash programme to repair the damaged roads.
该市启动了一项抢修受损道路的紧急计划。
grammar · medium
易错句子I signed up for a crash course of English.
正确表达I signed up for a crash course in English.
crash course 表示“速成课程”，后面固定用介词 in 引出学科或技能领域，不能用 of；of 表示所属关系，会把意思带偏。
grammar · medium
易错句子She went on crash diet before the wedding.
正确表达She went on a crash diet before the wedding.
crash diet 是可数名词短语，指“一次速成节食”，单数泛指时必须加不定冠词 a；汉语没有冠词，容易漏掉。
grammar · medium
易错句子The training was very crash.
正确表达The training was very intensive.
crash 作形容词只用于名词前作定语（a crash course），不能作表语，也不能被 very 修饰；表语位置要用 intensive 这类可作表语的形容词。
速成课程
She took a crash course in Spanish before her trip to Madrid.
她去马德里旅行前上了一门西班牙语速成课程。
速效减肥法；快速节食
Crash diets rarely lead to lasting weight loss.
速效减肥法很少能带来持久的减肥效果。
突击计划；紧急集中计划
The government launched a crash programme to build new hospitals.
政府启动了一项突击计划来建造新医院。
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