Examples
xué sheng学生men们yòng xīn用心xué xí学习le了hěn很duō多shǒu首shī诗。
学生们用心学习了很多首诗。
The students learned many poems by heart.
要用心，不要操心、烦心。
Be diligent, don't worry.
喏，这是我的秘密。很简单。只有用心才能看到本质的东西。精髓是眼睛看不见的。
And now here is my secret, a very simple secret: It is only with the heart that one can see rightly; what is essential is invisible to the eye.