 
                    
                    Have you ever wondered how an astronaut in space swallows food, or how you can drink a cola during a handstand, even with the force of gravity working against you? The answer is peristalsis, and we’ll explore it today alongside a SNEAK PEEK of our revamped Head & Neck model.阅读详情
 
        
         
             
                     
                     
                     
                     
                     
                     
                     
                     
                     
             
             
             
            