ret·ro·flex /ˈrɛtrəˌflɛks/
 (a.)反曲的;翻轉的


 Re·tro·flex Re·tro·flexed a.  Reflexed; bent or turned abruptly backward.

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 retroflex
      adj 1: bent or curved backward [syn: retroflexed]
      2: pronounced with the tip of the tongue turned back toward the
         hard palate [syn: cacuminal]
      v 1: bend or turn backward [syn: replicate]
      2: articulate (a consonant) with the tongue curled back against
         the palate; "Indian accents can be characterized by the
         fact that speakers retroflex their consonants"