位于下颌下腺内或下颌下腺导管__________、________的涎石,下颌下腺反复感染或继发_________________、_________,已失去摄取及分泌功能者,可采用下颌下腺切除术。
— What would you like to have, meat or fish?
— _____________________.
— ___________________
— Once or twice a week.
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