tā / zhī / dào / zì / jǐ / jiǎn / fù / yīn / cǐ / yì / zhí / nǔ / lì / dú / shū / xué / xí

他知道自己俭腹，因此一直努力读书学习。

Knowing that his knowledge was limited, he kept working hard at reading and studying.