A boy was sitting under a tree, with his back against it, playing on a rough wooden pipe.
一个男孩正坐在树下，背靠着树，在吹一根粗糙的木笛。
Stainless steel tube surface after sand blasting become rough and very evenly, can enhance the paint adhesion layer on the surface of stainless steel pipe.
不锈钢管表面经过喷砂变得粗糙又很均匀，能增强油漆层对不锈钢管表面的附着力。
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