M：在你正常的使用当中你通常如何知道你的电动牙刷是需要更换电池？A：一

M：在你正常的使用当中你通常如何知道你的电动牙刷是需要更换电池？<br>A：一般快用到最后的时候，那个电动牙刷的震动频率没有刚换电池的时候震动那么强，就很明显了，能感觉到可能该换电池了。<br><br>M：好的，你是从这个体现出来要换电池。

M: During your normal use, how do you usually know that your electric toothbrush needs to replace the battery?<br>A: Generally, at the end of use, the vibration frequency of the electric toothbrush is not as strong as when the battery was just replaced. It is obvious that it may be time to replace the battery.<br>M: OK, you need to change the battery from this.<br>

M: In your normal use, how do you usually know that your electric toothbrush needs to be replaced with batteries?A: Generally, the vibration frequency of the electric toothbrush is not as strong as when the battery was just changed, so it is obvious that it may be time to change the battery.M: OK, you need to change the battery.