A general dynamic model and differential equations for an unsymmetrical projectile traveling in a flexible, increasing twist rifled bore gun tube are developed.

建立了非对称弹丸在挠性渐速膛线身管内的弹丸一般运动动力学模型和运动微分方程组。

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At last, acquired conclusion is that band cut is not only in relation to gun bore wear and bore pressure, but also to length of heavy wear section.

最后得出结论：弹带削光不仅与内膛磨损量和膛压大小有关，还与严重磨损段的长度有关。

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The imaging quality of CCD camera for the inner bore of a gun barrel has been improved. The luminance, uniformity, color and sharpness of image have attained a good effect.

提高了CCD摄像机在炮管内膛的成像质量，使图像在亮度、均匀性、色彩和清晰度方面达到很好效果。

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These moves may seem small-bore compared to gun laws in many other countries, but they are a very big deal here, and it is hard to see how the ban on assault rifles will get past Republican (and indeed some Democratic) opposition in Congress.

BBC: President Obama's next campaign - against the gun lobby

The Sports Council for Wales has recognised the need for an Olympic standard range for air gun, air rifle, and small bore rifle shooting.

BBC: Youth airgun marksman

The prosecution also alleges the defendant handed Mr Duggan the gun in a shoebox, 12 to 15 minutes before he was shot and that the box bore the fingerprints of Mr Duggan, Mr Hutchinson-Foster and his girlfriend Desire Cox.

BBC: Mark Duggan