by heart片語KK [baɪ hɑrt] /baɪ hɑɹt/發音片語1熟記、背下來、記牢She learned the whole poem by heart in one evening.她一個晚上就把整首詩背下來了。2憑記憶He played the entire sonata by heart, without any sheet music.他全憑記憶彈完整首奏鳴曲,沒有看樂譜。