cation exchange site

• 阳离子交换点

cation exchange site的用法和样例：

例句

1. I should like to exchange a few words with you in confidence.
   我想私下和你交换点意见。
2. Including the establishment of clean needles exchange points, to open out-patient methadone maintenance therapy, achieving remarkable results.
   包括设立清洁针具交换点，开设美沙酮维持治疗门诊等，取得明显效果。