n.四環(huán)素（抗生素的一種）

Of the isolates tested, the percentage of strains resistant to Tetracycline was not applicable. 測試樣本中,對四環(huán)素的抗藥性測試是不適用的。

Tetracycline has no demonstrable effects on the central nervous system, neither has chloromycetin. 四環(huán)素對中樞神經(jīng)系統(tǒng)沒有明顯作用，氯霉素對中樞神經(jīng)系統(tǒng)也沒有明顯作用。