对生物结构的观测表明在孔口附近的纤维是连续绕过的，已有实验证明这种绕孔结构的强度比钻孔结构有显著提高。
From the observation of biological structure, it was found that the fiber changes its density and direction continuously when passing around a hole.
对生物结构的观测表明在孔口附近的纤维是连续绕过的，已有实验证明这种绕孔结构的强度比钻孔结构有显著提高。
From the observation of biological structure, it was found that the fiber changes its density and direction continuously when passing around a hole.
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