water-tight packing

• 1. 不透水密封: water-tight seal
• 2. 不透水密封垫: watertight seal

• 1.当陷阱阀门关闭的时候，植物在阀门周围的特殊角质层上分泌粘液，形成不透水密封垫。
  When the trap door shuts, the plant excretes mucilage next to a special cuticle around the door, creating a watertight seal.
  dict.yoduao.com

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