rough·en /ˈrʌfən/
  (vt.)(vi.)(使)變粗糙
  Rough·en v. t. [imp. & p. p. Roughened p. pr. & vb. n. Roughening.]  To make rough.
  Rough·en, v. i. To grow or become rough.
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  roughen
       v : make rough or rougher; "rough the surfaces so they will
           stick to each other" [ant: smooth]