They lived with their mother in a sand-bank, underneath the root of a very big fir-tree.
它们和妈妈住在一堆沙丘里，在一棵巨杉树的根下面。
This paper introduces a comparative study of vibration characteristics of two types of rotor blades that are attached to the disk by fir-tree root and pin respectively.
本文介绍关于两种转子叶片振动特性的比较研究，这两种叶片分别是用销钉和纵树形或燕尾形榫头联接到旋转轮盘上的。
They lived with their Mother in a sand-bank, underneath the root of a very big fir-tree.
它们和妈妈住在沙州上的一个很大的枞树洞里。
Stress distributions on the 1000mm fir tree blade root and the rim are studied through finite element method and photoelastic method.
本文介绍了用有限元和光测弹性方法，研究1米长叶片枞树型叶根和轮缘的应力分布。
Stress distributions on the 1000mm fir tree blade root and the rim are studied through finite element method and photoelastic method.
本文介绍了用有限元和光测弹性方法，研究1米长叶片枞树型叶根和轮缘的应力分布。
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