As structural component, square hollow steel sections have favorable properties for resisting compression, bending and torsion.

方管作为结构构件，在压、弯、扭方面具有优越的性能。

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Experimental results show that this algorithm is robust and the hiding text is invisible, and it is excellent in resisting the JPEG compression resistance, noise and clipping.

实验表明，该算法具有较强的鲁棒性和不可见性，在抵抗JPEG压缩、噪声、剪切等干扰具有较优良的性能。

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Compared to the original algorithm, the security and the ability of resisting some attacks such as cutting and JPEG compression were obviously enhanced in the watermark system.

改进后的算法与改进前相比较，水印系统的安全性得到了提高，且对抗剪切、JPEG压缩等攻击的能力明显增强。

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