剑桥词典[ 可数名词：有复数形式的名词 ] plural plicaeplicasa fold or ridge in the skin （皮肤的）皱襞，褶 Plica Syndrome occurs when the plica becomes irritated or inflamed . 当皱襞变得发红或发炎时，就出现了皱襞综合症。 [ 不可数或单数名词：没有复数形式的名词 ] (also plica plonica) very dirty hair that is twisted into firm , tangled masses 纠发症 返回 plica