酗酒成性的人承认饮酒过度是弊多利少，他这样说实际是自己打自己的嘴巴。 By admitting that excessive drinking does more harm than good, the man who indulged in the practice was condemned out of his own mouth.
守口的人一个嘴巴紧闭的人，尤指能保守秘密的人 A close-mouthed person, especially one who can keep a secret.
她的小嘴巴一噘，眼泪汪汪。 Her little mouth pucker up and tear fille her eyes.
牙科大夫要处置的（患者）嘴巴一般并不处在理想状态。 The mouth the dentists work on usually is not in an ideal