An enclosing membrane, as that covering the sorus of a fern.

 
  • 囊群盖一种包裹其它物的膜,如蕨类植物的孢囊群的覆盖膜
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  • 深远海浮式风电平台 - deep-sea floating wind power platform
  • 京雄高速公路 - Beijing-Xiongan expressway
  • 农业及相关产业增加值 - the added value of agriculture and related industries
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