困扰现代中国人口腔健康主要有七大问题，包括龋齿，牙石，牙菌斑，牙龈出血，牙本质敏感，牙齿不洁白和口气。
Troubled modern Chinese oral health main seven big problems, including dental caries, plaque and tartar, bleeding gums, teeth, sensitive nature teeth are white and tone.
中国，上海——超级都会上海是中国人口最多的城市。作为现代国际金融中心，它还拥有丰富的历史文化内涵。
Shanghai, China – The enormous metropolis of Shanghai -- China's most populous city -- has an historic urban core which sits alongside its status as a contemporary, global financial hub.
中国，上海——超级都会上海是中国人口最多的城市。作为现代国际金融中心，它还拥有丰富的历史文化内涵。
Shanghai, China – The enormous metropolis of Shanghai -- China's most populous city -- has an historic urban core which sits alongside its status as a contemporary, global financial hub.
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