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。
The teacher asked us to learn by heart as many excellent poems as possible.
老师要求我们尽量多背些美妙的诗歌。
You'd better underline these words and try to learn them by heart.
你最好在这些单词下面划上横线，并且努力把它们背下来。
It 's very difficult for the children to learn the poem by heart.
对孩子们来说背诵那首诗很困难。
The teacher asked us to learn the poem by heart.
老师让我们背诵那首诗。
Vocabulary: You need to learn words by heart.
词汇：你需要学习的心脏的话。
He had managed to learn the contents of the letter by heart.
他已设法把这封信的内容背了下来。
He had managed to learn the contents of the letter by heart.
他已设法把这封信的内容背了下来。
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