Preconcentration
n. 预选；预浓缩；预先富集
🗣️ 情景例句
Welcome.
欢迎你。
Do you think you could lend me some of your records/CDs?
请问你能借我几张唱片吗？
Seeing a cake flying through the air, a lorry driver who was drawing up alongside the car, pulled up all of a sudden.
此时，一辆卡车正好从后边开到那辆汽车边上，司机看见一块蛋糕从天而降，紧急刹车。