传声管

展品说明：

声波的传播和光波一样，在传播过程中遇到障碍物可反射回来。根据排箫原理，管径形状及长度的不同，听到的声音也不同。

Exhbit Explanation:

Elexibility refers to the stretching ability of the joints, muscles and ligaments for the human body to complete a movement. Increased flexibility has a positive effect in enhancing the coordination ability of the body, developing strength, speed and other qualities.