Examples
zhè这běn本shū书shì是tā他rè xīn热心yán jiū研究de的chéng guǒ成果。
这本书是他热心研究的成果。
This book is a result of his enthusiastic research.
他把情感藏进了心底，装出热心的样子。
He hid his emotions and pretended to be enthusiastic.
老板在的时候他就装成一副很热心的样子。
He pretends to be enthusiastic when his boss is around.