Internal stresses have been studied more deeply in metal materials and its theory has developed relatively mature, while in inorganic non-metal materials it is comparatively laggardly.
目前，国内外
个方面的研究深度不够。
缓慢地Internal stresses have been studied more deeply in metal materials and its theory has developed relatively mature, while in inorganic non-metal materials it is comparatively laggardly.
目前，国内外个方面的研究深度不够。
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