当波从小扰动源向各个方向均匀传播时，其强度的变化与距离的平方成反比。
When a wave travels uniformly in all directions from a small source, the intensity varies inversely as the square of the distance.
要把握一个刀在一个直立的时尚和新闻纸上的一些强度均匀。
One must grasp the knife in an upright fashion and press evenly on the paper with some strength.
结果表明：竹纤维混纺纱有害纱疵少，条干均匀， 强度好。
The result shows that bamboo fiber blended yarn has fewer harmful defects, better evenness and better strength.
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