在确定指导用户行动指引对于他们来说是多有有效时，每一部分都是要害。
Each plays a vital part in determining how effective the call to action is in directing the user.
下一步要改良的就是用户体验和音效，它包括四个要害身分：时延、衰减、频率响应和反映节制。
What should improve next is user experience symphonious effect, it includes factor of 4 crucial point: Delay when, attenuation, frequency is answered and echo is controlled.
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