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1·It's awfully puzzling, said Tootles, who knew the story by heart.

“这太令人费解了。”图图说，他已经把这个故事熟记于心了。

2·Mack knew this passage by heart.

麦克会背这一段。《柯林斯英汉双解大词典》

3·She's learnt the whole speech off by heart.

她把整篇讲话都背熟了。《牛津词典》

4·I've dialled the number so many times I know it by heart.

这个号码我拨了很多次，都记住了。《牛津词典》

5·You may find yourself having to learn something by heart.

你可能发现自己不得不记住一些东西。

6·We all paid more attention to watching them by heart.

我们都更注意用心观察它们。

7·Not by brain, by heart; the expression is vital.

不是用头脑，而是用心；表达是至关重要的。

8·The view of repetitively boring lessons and learning the facts by heart, which is sometimes quoted in relation to Japanese classes, may be unfair and unjustified.

有时课程重复枯燥和学生死记硬背的现象会和日本的课堂联系在一起，这可能是不公平、不合理的。

9·The actor knows his lines by heart.

那位演员能够背诵自己的台词。

10·Li Xin likes to learn words by heart.

李信喜欢背单词。