Either of the leathery or chitinous forewings of a beetle or a related insect, serving to encase the thin, membranous hind wings used in flight.
鞘翅甲虫或其它相关的昆虫的一对坚韧的或几丁质的前翅，用于保护飞行中薄的、膜状的后翅。
The bony semicircular canal was drilled until it was so thin that the membranous canal was visible as blue color, called blue line.
磨削骨半规管透过菲薄的骨质显示暗蓝色的膜半规管即为“蓝线”。
The I-type chloride cells are large and have lowdensity of cell matrix. Tubule system consists of many membranous thin branchy tubules.
型氯细胞胞体较大，细胞基质密度较低，微细小管系统发达呈细管状；
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