Because tetracycline 's secreted by a soil bacterium , streptomyces .

因为四环素是由土壤中的一种细菌链霉菌分泌而成。

It contains a solid dose of fluoride and works better than the antibiotic tetracycline .

它包含了一定的氟化物而且效果优于抗生素四环素。

Those frustrating days of tetracycline and gritty soaps left my face not clean and glowing but red and raw .

在那些恼人的日子里，四环素和磨砂肥皂不仅没有让我的面部光洁，反而使它又红又粗糙。

Numerous bacterial infections such as stomach ulcers caused by helicobacter pylori are treated with a class of drug known as tetracycline antibiotics .

多种细菌感染，如由幽门螺旋杆菌引起的胃溃疡，治疗的一类药物称为四环素抗生素。

The list of drugs that can cause sun sensitivity is long , but among the most common culprits are antibiotics like tetracycline , certain antihistamines and topical antimicrobials .

可能导致光敏感性的药物有很多，但最常见的当属抗生素，例如四环素、某些抗组胺和局部抗菌药。