不懈

他从早到晚都在学习。

tā cóng zǎo dào wǎn dōu zài xuéxí.

He studies from morning till night without ever stopping

她总是不厌其烦地帮助别人。

tā zǒng shì bù yàn qí fán de bāngzhù bié rén.

She always helps others patiently without ever getting tired