1. The hollow stemlike main shaft of a feather. 
   翎管羽毛的中空的茎状羽干
2. A hollow shaft that rotates on a solid shaft when gears are engaged. 
   套管轴齿轮啮合时，在一固定机轴上旋转的中空轴
3. One of the light, flat growths forming the plumage of birds, consisting of numerous slender, closely arranged parallel barbs forming a vane on either side of a horny, tapering, partly hollow shaft. 
   羽毛构成鸟类羽毛的轻且平的一种生长物，由大量细长的、紧密并列的钩在一个角状的、中空的锥形羽轴两边所形成的羽片
4. elementary theory of shaft 
   轴的基本理论
5. ground pressure around shaft 
   立井地压

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