This craft is valuable resource of developing national culture and also a good source material of national culture research.
这一工艺是民族文化开发的珍贵资源，也是民族文化研究的好素材。
The wheel web, by virtue of its geometry and material characteristics, is a good emitter of high-frequency sound, and is believed to be the primary source of curve squeal noise.
尺寸和材料的特性导致了轮辋是一个良好的高频声源，轮辋也被认为是曲线尖啸噪声的主要来源。
Permian -carboniferous hydrocarbon source rocks in Nanhuabei basin are widely distributed and have various types, which have offered the good material base for the oil and gas generation.
南华北盆地石炭-二叠系烃源岩分布广泛、类型多样，为油气生成提供了良好的物质基础。
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