1.the center of an object;
the ball has a titanium core
2.a small group of indispensable persons or things;
five periodicals make up the core of their publishing program
3.the central part of the Earth
4.the choicest or most essential or most vital part of some idea or experience;
the gist of the prosecutor's argument
5.a cylindrical sample of soil or rock obtained with a hollow drill
6.the central meaning or theme of a speech or literary work
7.the chamber of a nuclear reactor containing the fissile material where the reaction takes place
8.a bar of magnetic material (as soft iron) that passes through a coil and serves to increase the inductance of the coil
1.remove the core or center from;
core an apple
中國開放教育資源協會(China Open Resources for Education 簡稱 CORE)成立于2003年10月,系非盈利機構,是一個以部分中國大學及全國省級廣播電視大學為成員的聯合體。 CORE是在中國走向信息化和教育國際化,國際教育資源共享運動潮流的推動下誕生的。2003年9月,IET基金會(International Engineering Technology Foundation簡稱IETF)、麻省理工學院(Massachusetts Institute of Technology簡稱MIT)和北京交通大學在北京共