通过对枪弹撞击玻璃所产生的破碎裂纹进行了理论分析及实验，得出了玻璃袭纹与射击距离的关系。

According to the experiments and theory analysis of the crackle on the glass by bullet hitting, we get the relationship between the glass crackle and the distance of shooting.

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因此，成簇形状（内置微裂纹）可吸收压力一致预防小的裂缝和大的碎裂。

Therefore, "tufts" — built-in micro cracks — absorb pressure in unison to prevent splits and major fractures.

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或轴承有裂纹、内外圈碎裂或轴承过度磨损时，应更换新轴承。

Or bearing crack, inside and outside circle chipped or bearing excessive wear when, should replace new bearing.

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