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.
它们和妈妈住在一堆沙丘里，在一棵巨杉树的根下面。
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。
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