n.逆流；反流；逆電流

Countercurrent washing is applied to reduce acid pollution effectively. 摘要采用逆流洗滌方式有效減輕酸污染。

Below a few kinds of circumstances, cause countercurrent sex esophagitis extremely easily. 下面幾種情況，極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機(jī)能不全，則會(huì)出現(xiàn)反流。