1. Improve the ultrasonic diagnosis ability of residents: By learning the relevant knowledge and skills in this book, residents can better understand the basic principles and clinical applications of ultrasonic diagnosis and improve their ultrasonic diagnosis ability.

2. Enhance the operational skills of residents: books on ultrasound introduce the operational skills under the guidance of ultrasound. Through study and practice, residents can master the operation skills under the guidance of ultrasound and improve their operation skills and operation level.

3. Help residents better understand the development trend and application prospect of ultrasound: As a non-invasive diagnostic technology, ultrasound has broad application prospects. By studying the book Ultrasound, residents can better understand the development trend and application prospect of ultrasound and lay a solid foundation for future clinical work.