ra·zor·back /ˈrezɚ/
 狹尖的背脊,剃刀鯨,剃刀的鋒口,鮮明的分界線,緊急關頭


 Ra·zor·back n. Zool. The rorqual.

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 razorback
      adj : having a sharp narrow back; "a razor-backed horse";
            "razorback hogs" [syn: razor-backed]
      n 1: a mongrel hog with a thin body and long legs and a ridged
           back; a wild or semi-wild descendant of improved breeds;
           found chiefly in the southeastern United States [syn: {razorback
           hog, razorbacked hog]
      2: any of several baleen whales of the family Balaenopteridae
         having longitudinal grooves on the throat and a small
         pointed dorsal fin [syn: rorqual]