Preconcentration
n. 预选；预浓缩；预先富集
🗣️ 情景例句
Tom, is that you?
汤姆，是你吗？
How many provinces do you have?
你们有多少个区？
The Verrazano Bridge, which was designed by Othmar Ammann, joins Brooklyn to Staten Island.
维拉萨诺大桥由奥斯马。阿曼设计，连结着布鲁克林与斯塔顿岛，