搭配 “learn something by heart 用心学某事” 的含义是 “记住某事”，即 “凭记忆背下来”。人们也用 “learn something off by heart” 表示相同的意思。

例句

She had learnt her presentation off by heart; she didn't look at her notes once!

她把这次演讲要说的话都背下来了，她一次也没看准备的笔记！

I had to learn poems by heart at school; I can still recite them now.

我上学那会儿要背诗，到现在我还能背下来呢。

Actors have to learn all their words by heart, so that they can remember them during a performance.

演员得牢牢记住台词，这样他们才能在表演时记住要说什么。