protective envelope

英 美
  • 保护层[套;膜;外壳]
    1. In some viruses the nucleocapsid is surrounded by an envelope.
      某些病毒的核衣壳是由被膜所包绕。
    2. Freda security film is the latest high-tech protective equipment.
      福瑞达安全膜是最新高科技防护装备。