authoritative

adj. /əˈθɔːrəteɪtɪv/ B2

权威的；可信的

Reliable and showing expert knowledge or respected power.

仙境例句

The Mock Turtle's story of the sea school was authoritative, for he had been there himself.

假海龟讲的海底学校的事很可信，因为他亲自在那里上过学。