Taking care of his sister's children was a crash course in parenting for him.照看他姐姐的孩子对他来说就是一个育儿速成培训。Before her trip, she took a crash course in Russian culture and history at the local university.旅行之前，她在当地的大学上了一个速成班，学习俄罗斯文化和历史。He took a crash course in Spanish.他修读了一门西班牙语速成课。