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gum MOUTHgQmn [C]either of the two areas of firm pink flesh inside the mouth which cover the bones into which the teeth are fixed齿龈;牙床I've got really sore gums.我真的牙床痛。If you brush your teeth too hard, your gums may start to bleed.如果你刷牙太用力，你的齿龈也许会开始出血。A gum shield is a device which boxers put inside their mouths in order to protect their teeth and gums during fights.拳击运动员的护齿
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