?记住

... keep one's head 保持冷静；保持镇定 learn by heart 记住；默记；背诵 lose heart 丧失信心，失去信心；丧失勇气 ...

?背诵

...-星火学习网学习考试... lose one's head 仓皇失措，慌乱 learn by heart 背诵，记住 lose heart 失去勇气，丧失信心 ...

?背熟

... learn by oneself=teach oneself自学 learn by heart背熟 a year and a half(one and a half years)一年半 ...

?牢记

... Desperate Housewives《绝望的主妇》不但剧情贴近生活，其中口语也生动活泼，我们能从这部美剧中学到很多实用的流行美式俚语哦。 33 Learn by heart 牢记 34 On hold 尚未办理的事情 ...