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。

youdao

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。

youdao

All children were required to learn the Green Book, and some could recite passages by heart.

全国所有孩子都被要求学习绿皮书，有些章节甚至需要身心投入地背诵下来。

youdao

And in that kind of madrassa, you have kids getting up at 4:00 in the morning, and they sway backwards and forwards as they attempt to learn the entire Koran by heart.

NPR: Pakistan to Expel Foreign Students at Religious Schools

By treating the cells as heart cells would be treated and using a pacemaker to help them learn how to pump, they grew into a heart that could pump -- essentially rebuilding the organ's interior.

CNN: New hope may lie in lab-created heart