Preconcentration
n. 预选；预浓缩；预先富集
🗣️ 情景例句
Do have some more, there's plenty left.
多吃一点，还有很多呢！
Boy, you are in a lousy mood!
天啊，你情绪糟糕透了！
He has to take care of his sick mother.
他得照顾他生病的母亲。