tetracycline metaphosphate complex

例句：

1. 1. The antibiotic tetracycline is commonly used to treat bacterial infections.
   四环素常用于治疗细菌感染。
2. 2. The metaphosphate complex was found to be effective in reducing soil acidity.
   发现该磷酸盐复合物能有效降低土壤酸性。
3. 3. In the treatment of tuberculosis, the tetracycline-metaphosphate complex is often used as a first-line medication.
   在治疗结核病时，四环素-磷酸盐复合物通常作为一线药物使用。