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》

But I don't need to read them because I know it by heart.

但是我不需要读出来因为我已经深深的刻在我的心里了。

youdao

I can recite this poem without looking at it. I know it by heart.

我不用看就能把这首诗背出来。我已经把它背下来了。

youdao

I can recite this poem without looking at it. I know it by heart.

我不用看就能把这首诗背出来。我已经把它背下来了。

youdao