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abbr. 上一个（previous）
🗣️ 情景例句
What I'm trying to say ...
我想说……
I know the boy whose father is a medical doctor.
我知道那个男孩的父亲是医师。
Once we get down to the oil, it usually flows to the surface because great pressure,
一旦到达油层，石油就会由于地下巨大的压力流到地面上来，