pneumaticity
(biology) The state of being pneumatic, or of having a cavity or cavities filled with air.
polymethyl methacrylate (polymer of methyl methacrylate), a tough transparent plastic used sometimes in lieu of glass.
simple past tense and past participle of plant one's feet
To modify the design of an existing system, organization, process or product in order to make it more effective, efficient or responsive.
その化石が顕著に空洞に空気を含んでいることは、現生の鳥類に見られるような複雑な空気嚢系を示唆している。
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