authentic
a. 1.真的,真正的;2.可靠的,可信的
A: John has such an authoritative">authoritative voice. It is frightening.
B: I find him scary at times also.
authoritative
a. 1.权威性的,可信的;2.专断的,命令式的
A: Stop! You are not authorized">authorized to enter this section of the building.
B: Oh, I’m sorry, I didn’t realize that I needed special permission.
authorize
vt. 授权,批准
A: What are you reading?
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