以下为句子列表：
英文: Based on the transfer-matrix method, the general expressions of equivalent four-terminal network parameters of varying section torsional horn are derived, the relations between frequency equation and both the rotational velocity amplification and that of
中文: 摘要基于传递矩阵算法，推导出了变截面杆扭转振动时等效四端网络参量的一般表达式，研究了带类余弦过渡段阶梯形变幅杆扭转振动频率方程与角速度放大倍数及外表面切向速度放大倍数等的关系。
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英文: To make a rotation curve one calculates the rotational velocity of stars along the length of a galaxy by measuring their Doppler shifts, and then plots this quantity versus their respective distance away from the galactic center.
中文: 沿着银河的长度通过测量它们的多普勒变换计算星系的旋转速度的旋转曲线,然后绘出它们分别远离银河中心的距离。
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