The academic knowledge on book is the summary of practice and sublimate , direct palpability , but need to examine with practice again conversely 书本上的理论知识是实践的总结和升华，直接明了，但反过来又需要用实践来检验。
2.
The image that it acquires is unusual clarity , careful , make the doctor organizes clear in that way , palpability as seeing human body is in - house directly , rose to diagnose efficiency greatly , avoided a lot of bosoms or paunch to probe diagnostic operation 它所获得的图像异常清楚、精细，使医生如同直接看到了人体内部组织那样清楚、明了，大大提高了诊断效率，避免了许多胸或剖腹探查诊断的手术。
