大家排了那么长的队伍,就是为了等我的正确答案吗,哈哈。. B0 Z. h# _, a+ ^! v; v
# f4 l2 i( A2 G5 n0 OToothed Blades: Toothed blades are useful (before using the regular blade) when working extremely difficult woods, because they score fibers in a criss-cross pattern. They are also used to prepare surfaces for gluing, as in veneering, by lightly roughening the surface.