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来源:雅诚德英语网
Use your thumbs and forefingers to gently pull the floss from the gumline to the top of the tooth to scrape off plaque.
用拇指和食指沿着齿龈向牙冠方向缓和地拉扯牙线,以去除牙菌斑。
Use your thumbs and forefingers to gently pull the floss from the gumline to the top of the tooth to scrape off plaque.
用拇指和食指沿着齿龈向牙冠方向缓和地拉扯牙线,以去除牙菌斑。