Mack knew this passage by heart.麦克会背这一段。You must keep repeating the lines until they are known by heart.你必须反复朗读这几行一直到能背诵为止.The boy learned the poem by heart.这男孩背下了这首诗....

learn by heart的音标：learn by heart的英式发音音标为：[lə:n bai hɑ:t]learn by heart的美式发音音标为：[lɚn baɪ hɑrt]...

凭记性...

We had better learn by heart as many sentence patterns as we can.我们最好尽可能多背句型.The text is too long for us to learn by heart.这篇课文太长了,以致我们不能够记住.Irrealizable for my lovingness girl . every little bit, I learn by heart.对最爱的人食...

learn sth by heart的音标：...

n.背诵，熟记...

by heart的音标：by heart的英式发音音标为：[bai hɑ:t]by heart的美式发音音标为：[baɪ hɑrt]...

v.记住，读熟，记诵，牢记...