a.  正宗的，原汁原味的 ≈ genuine

a.  原作的，真迹的，原创的 

≈ genuine ≠ inauthentic

a.  可靠的，真实的

a.  逼真的

• authenticity   n. 真实性，确实性，可靠性

• authentic work by Picasso  毕加索的真迹 

• an authentic account of  对…的真实描述

• authentic model  仿真模型

• The FBI worked closely with the Archives to determine that the letter was both authentic and definitely Smithsonian's property.

  信是真迹

• They proved its authenticity.  证实其真实性

• To try authentic Indian food.  正宗的印度食品

• Actors dressed in authentic costumes re-enact the battle.

  演员们穿着仿真的戏装重现了那次战役。

• I don't know if the painting is authentic.

  我不知道这幅画是不是真迹。

• I had obtained the authentic details about the birth of the organization. 我已经弄到了有关该组织成立的可靠的详细资料。

• Archaeological evidence may help to establish the authenticity of the statue.

  考古证据可能有助于确定该塑像的真伪。

BrE /ɔːˈθentɪk/

NAmE /ɔːˈθentɪk/