Smms
abbr. seromucous maxillary sinusitis 浆液粘液性上颌窦炎; switched multimegabit data service 交换式多兆比（特）数据业务
🗣️ 情景例句
We want to keep customers happy.
我们必须让顾客满意。
Keep your breath to cool your porridge.
少管闲事。
Come in and have a seat.
请进来坐。