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1·Mandarin tone is the patterns of pitch variation, so it may be acquired by pitch extraction.

声调是基频变化的模式，因此可通过基频提取来获取声调信息。

2·In the words flow, the reading intonation, which is related to tone, degree, stop and linking, speed and other factors, is the general pattern of the pitch variation.

朗读的语调是语流中呈现出来的音高变化的总体模式，它与字调、轻重、停连、快慢等因素有关。

3·In addition, the variation of pitch had some effect on the image noise.

此外，当螺距改变时，图像噪声亦呈现出规律性的变化。

4·In Chinese, lexical tones and intonation both depend on the variation of pitch.

在汉语中，声调和语调均依赖于音高的变化。

5·The variation of pitch contour is an important parameter for speech recognition and transmission.

音调变化在语音识别和语音传输中是一个重要参数。

6·The tone is the variation of pitch .

声调是音节的音高变化。

7·The recent developments of modified pitch in China are introduced. The new manufacturers for pitch, improvement for technological process as well as its variation trends of standard are reviewed.

阐述了国内改质沥青的一些最新进展；介绍了一些新的改质沥青企业、生产技术的完善情况以及改质沥青的标准变迁情况。