petrolatum ointment

例句：

1. 1. This petrolatum ointment is very effective in treating skin infections.
   这种石蜡软膏在治疗皮肤感染方面非常有效。
2. 2. The doctor prescribed a special petrolatum ointment for his patient's wound.
   医生为他的病患开了一种特殊的石蜡软膏。
3. 3.The patient applied the petrolatum ointment twice daily to prevent infection.
   患者每天两次使用石蜡软膏以防止感染。