To estimate the clinical effect of the dentifrice with xylitol in control of plaque.


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.


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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