单词：positive column
positive column的用法和样例：
例句
- Finally, the positive column is reached where electrons and ions have equal densities.最后到达的区域是正柱区，这里，电子和离子具有相等的密度。
- Bubbles float centripetally from the thin froth area and upward from the central part of liquid column area.气泡分别从薄层区径向向内和从液柱区中心部位轴向向上进入泡沫区。
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