c结尾的单词的复数

　　The doctor put her on antibiotics.

　　医生要她服用抗生素。

　　The doctor put me on antibiotics.

　　医生要我服用抗生素。

　　The doctor gave me a prescription for antibiotics.

　　医生给我开了抗生素。

　　Doctors have been criticized for their indiscriminate use of antibiotics.

　　医生被指责滥用抗生素。

　　Antibiotics are only available by prescription.

　　抗生素只能凭处方购买。