by heartWiktionary 原文英/baɪ ˈhɑːt/美/baɪ ˈhɑrt/词源链中古英语Middle English约 1150–1500 年by herte↓ 继承英语Englishby heart词源说明From Middle English by herte. Compare French par cœur (literally “by heart”), of which the English may be a calque.释义介词短语prepositional phrase1From unaided memory and in full detail.同族词派生词 1byheart