Preconcentration
n. 预选；预浓缩；预先富集
🗣️ 情景例句
They come back here for lunch,
他们回到这儿来吃午餐，
I'm going shopping because I need to buy some clothes.
我要去购物，因为我需要买一些衣服。
He thought they needed to know the direction to it.
它们还需要知道去那里的方向。