upper gauze

例句：

1. 1. The upper gauze is used to cover the wound for protection.
   上层纱布用于覆盖伤口以保护。
2. 2.The surgeon carefully removed the upper gauze from the patient's wound.
   外科医生小心地从病人的伤口上取下上层纱布。
3. 3. The upper gauze was replaced with a new one after cleaning the wound.
   清洁伤口后，用新的上层纱布替换了旧的。