- (of singing) with clear articulation and a mellow and full tune
- 人字正齿轮: double helical spur gear; double-helical gear; doublehelical urgear
- 数字正弦机: digital sine-wave generator
- 数字正交模型: digital orthogonal model
- 数字正射影象: digital orthoimage
- 数字正射影像图: doq digital orthophoto quadrangles
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