重心
?center of gravity
?heart;crux;core;focus
世界事務(wù)的～正從過去三個(gè)世紀(jì)以來一直所在的大西洋轉(zhuǎn)向太平洋。The center of gravity of world affairs is shifting from the Atlantic,where it was lodged for the past three centuries,to the Pacific./工作～ focus of our work/問題的～heart (or crux)of the matter