他致力于环保工作。
tā zhìlì yú huánbǎo gōngzuò 。
He is devoted to environmental protection work.
我们致力于提高教育质量。
wǒmen zhìlì yú tígāo jiàoyù zhìliàng 。
We are dedicated to improving the quality of education.
她致力于帮助贫困学生。
tā zhìlì yú bāngzhù pínkùn xuéshēng 。
She is committed to helping impoverished students.