对于我们来说使用电动牙刷刷牙很容易.It's ______ for us ______ ______ our teeth by using electric toothbruses.

问题描述:

对于我们来说使用电动牙刷刷牙很容易.
It's ______ for us ______ ______ our teeth by using electric toothbruses.



填 easy    to brush


保证准确率~