To estimate the clinical effect of the dentifrice with xylitol in control of plaque.
评价木糖醇牙膏在抑制菌斑生成的临床效果。
,

To estimate the clinical effect of the dentifrice with xylitol in control of plaque.
评价木糖醇牙膏在抑制菌斑生成的临床效果。
He was in control of the car.
他负责这辆小汽车。
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