Preconcentration
n. 预选；预浓缩；预先富集
🗣️ 情景例句
Do you think the skirt length is right, Ellen?
觉得这裙子长度合适吗，Ellen？
The plans are not even made yet.
这计划还不曾有人策划过。
We can't go to the public parks or swimming pools.
我们不能上公园或是去游泳池。