Haffkine serum

例句：

1. 1. The Haffkine serum has been shown to be effective in treating certain cancers.
   哈夫金血清已被证明对治疗某些癌症有效。
2. 2. The researchers used the Haffkine serum to test their hypothesis.
   研究人员使用哈夫金血清来测试他们的假设。
3. 3. The patient was given a dose of the Haffkine serum as part of their treatment.
   患者作为治疗的一部分接受了哈夫金血清的剂量。