1. 授权：DNS服务器的角色可以分成3种:根(Root)、授权(Authoritative)和解析(Resolver). 不同角色的DNS对安全的要求层次也不同. 由于历史原因,所有的根服务器都分布在北美和欧洲. 我国电信运营商,一般都会在各省统一部署DNS服务器,
2. 权威：AUE²:权威(Authoritative)有用(Usable)有趣(Enjoyable)高效(Effective) 5年级的学生除了具备一定分析能力,对社会也有了认知和自己的见解. 刊物让学生结合课堂知识的学习,观察大自然、思考人类社会,灵活运用书面文字表达自己的观察所得.
1. 权威的;威严的;有威信的
Someone or something that is authoritative gives an impression of power and importance and is likely to be obeyed.
e.g. He has a commanding presence and deep, authoritative voice...
他仪态威严，声音低沉，说话有威信。
e.g. Her smile was warm but authoritative.
她的笑容很和蔼，同时又透着威严。
2. （在某一方面）权威性的，可信的
Someone or something that is authoritative has a lot of knowledge of a particular subject.
e.g. The first authoritative study of polio was published in 1840...
关于小儿麻痹症的第一篇权威性研究报告发表于1840年。
e.g. The evidence she uses is usually highly authoritative.
她采用的证据通常都具有很高的可信度。
1. Compiling the Xinhua Dictionary was supported by late Premier Zhou Enlai in 1971 with an aim to offering an authoritative reference on the Chinese language.
2. The lack of an authoritative explanation more or less disappointed the participants of the CEE and the public.
3. The CEE is certainly authoritative and serious, but it is still a public issue.
4. " But I will invite authoritative research organizations from abroad to witness the challenge for me, " he said.
5. " The new department will become an authoritative and comprehensive planning center, " Luo said.
6. And then children below eight were advised not to use mobile phones after an " authoritative report " linked heavy use to ear and brain tumours.
7. It is the first time that the authoritative data from the World Bank has confirmed this forecast.
8. Authoritative international economic analysis agencies predict that China will replace Germany in 2008 as the world's third largest economy.
9. Many authoritative observers have held the view that " Asia has always kept advancing despite setbacks " since the end of World War II.
10. According to authoritative sources, the output value of this new kind of endoscopy will reach a higher level still.
adj
1. 911查询·英语单词
1. sanctioned by established authority
e.g. an authoritative communique
the authorized biography
Synonym: authorized authorised
2. having authority or ascendancy or influence
e.g. an important official
the captain's authoritative manner
Synonym: important
3. of recognized authority or excellence
e.g. the definitive work on Greece
classical methods of navigation
Synonym: classical classic definitive