any of a series of radioactive elements with atomic numbers 89 through 103 同义词：actinide, actinon,
having a radial form; "starfish are actinoid--that is, they are radially symmetrical"
例句与用法
1.
On the base of serious summarizing the experience of more than 20 pilot villages of the all city during the past 7 years , twice villages surveys in large scale in 1999 and 2001 ( including over 200 villages ) and thirteen pilot villages in the project of rural development by technology and education project in beijing in 2002 , generalizing experience on how to develop village economy and rural development by technology and education project entirely , extrapolating the operating mechanism , management system and village development pattern in how to rely on technology to train rural elites and boom village economy especially . thereby , representing the conception , goal and operating clue of village economy and rural development by technology and education project for 21st century in beijing in detail . it is the first time to represent four operating thesis of rural development by technology and education project for 21st century in china systematically : system thesis of village productive forces ( inside ) ; regional actinoid thesis in village ( outside ) , operating thesis for origin , bank and fluid , and the thesis of biology balancing and limited factors 在认真总结北京市7年多来全市20余个科教兴村老试点和1999年、 2001年两次大规模村级调查( 200余村) 、北京市2002年十三个科教兴村新的试点的基础上，全面总结如何依靠科技、教育在发展村域经济、开展科教兴村等方面的经验教训，特别是重点总结归纳了7年来北京市如何依靠科技、培育乡土人才、促进村域经济发展的科教兴村的管理体系、运作模式、村级发展模式；在此基础上，详细阐述了21世纪北京市科教兴村的概念、目标和工作思路；并在国内首次较系统地、深入地阐述了21世纪科教兴村的四大运行理论基础：村域生产力系统理论(对内) 、村域区域经济发展辐射理论(对外) 、 “源、库、流”运转学说和“生态平衡理论和限制因子学说” 。
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