三等，拼音是sān děng，是一个汉语词汇，释义为三种等级。
adj. third-class
我是个穷人，女士。请给我安排一个三等病房。
I'm a poor man, madam. Arrange a third-class ward for me, please.
他感到船体刮到了冰山，带着家人匆匆离开了三等舱，向可能会把他们带到安全处的救生艇跑去。
He felt the ship scrape the iceberg and hustled the family out of its third-class quarters and toward the lifeboat that would take them to safety.
七减去三等于四。
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