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1. The use of antibiotics is permitted only in extremis.

只有在万不得已的情况下才允许使用抗生素。

2. Antibiotics were of no use, neither were other pharmaceuticals.

抗生素没有效果，其他药物也没有作用。

3. If the test is positive, a course of antibiotics may be prescribed.

如果化验结果呈阳性，可能会开一个疗程的抗生素。

4. She was on antibiotics for an eye infection that wouldn't go away.

由于眼睛感染一直不见好，她在服用抗生素。

5. Antibiotics should be used to clear up the infection.

应该用抗生素消除感染。