an arm of the State 是什么意思

an arm of the State 是什么意思 the arm of the the arm of the research council,an arm of the National Academy of Science,gathered its expert.这里arm是啥意思 FEED-OF-THE-ARM是什么意思? State of the Art the state of the state of art state of the state of the art the Secretary of State State of the art the state of being The decisive state of state-of-the In the state of California, state-of-the-art是什么意思 State of the Union 歌词