介于
between; intermediate; to lie between
借喻
to use sth as a metaphor
劫狱
to break into jail; to forcibly release prisoners
劫余
remnants after a disaster; aftermath
节育
to practice birth control
介于两难
to be on the horns of a dilemma (idiom)
低阶语言
low-level (computer) language
宫内节育器
intrauterine device (IUD)