He picked his teeth with a toothpick.
他用牙签剔牙。
He picked his teeth with a toothpick.
他用牙签剔牙。
The light microscope was used to observe the hesion from gums of teeth and focus of infection.
以消毒牙签
者口腔齿龈上或病灶表面附着物，生理盐水涂片，光学显微
下观察。
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