Preconcentration
n. 预选；预浓缩；预先富集
🗣️ 情景例句
It's raining cats and dogs outside.
外面下着倾盆大雨。
Saturday the whole family will clean out the garage.
周六全家动员打扫车库。
It marked the end of the great tradition of ships with sails and the beginning of a new era.
它标志着帆船伟大传统的结束与一个新纪元的开始。