cation exchange site的用法和樣例：
例句
- I should like to exchange a few words with you in confidence.
我想私下和你交換點(diǎn)意見(jiàn)。 - Including the establishment of clean needles exchange points, to open out-patient methadone maintenance therapy, achieving remarkable results.
包括設立清潔針具交換點(diǎn)，開(kāi)設美沙酮維持治療門(mén)診等，取得明顯效果。
