n.逆流；反流；逆电流
Countercurrent washing is applied to reduce acid pollution effectively. 摘要采用逆流洗涤方式有效减轻酸污染。
Below a few kinds of circumstances, cause countercurrent sex esophagitis extremely easily. 下面几种情况，极易造成反流性食管炎。
The function that Dan Rewei esophagus fights countercurrent is not complete, can appear countercurrent. 但若胃食管抗反流的机能不全，则会出现反流。
