Preconcentration
n. 预选；预浓缩；预先富集
🗣️ 情景例句
It was a pleasure meeting you, too.
我也很高兴碰到你。
What kind of climate do you have?Is it cold?
你们那里的天气怎么样？很冷吗？
Such creatures have rarely been seen alive by man as they live at a depth of six hundred feet.
人们很少能看到活着的这类动物，因为它们生活在600英尺深的水下。