What they all have in common is that the shape of the waveform (level versus time) is the main feature of interest.
用户对其感兴趣的是他们的共同点，即波形形状(电平随时间的波形)。
The main contributions of this thesis are summarized as follows: 1 Proposed a novel method using principal curve to describe the shape feature of 3d models.
本文的主要贡献如下：1提出一个用主曲线描述三维模型形状特征的新方法。
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