Preconcentration
n. 预选；预浓缩；预先富集
🗣️ 情景例句
Then think about the word in a sentence.
然后把这个词放到句子的环境中去。
Every man is the son of his own works.
种瓜得瓜，种豆得豆。
Old tunes are sweetest and old friends are surest.
老调最甜美，老友最可靠。