yolk sac inoculation

例句：

1. 1. The researchers performed a yolk sac inoculation to study the effects of environmental pollution on developing embryos.
   研究人员进行了卵黄囊内注射，以研究环境污染对发育中的胚胎的影响。
2. 2.During the procedure, the doctor carefully injected the medication into the patient's yolk sac.
   在手术过程中，医生小心翼翼地将药物注入患者的卵黄囊中。
3. 3.The yolk sac inoculation was successful, and the baby was able to survive after the operation.
   卵黄囊内注射成功，婴儿在手术后能够存活下来。