基石
foundation stone;cornerstone;keystone;bedrock;anchor
加強同第三世界國家的團結與合作，是中國對外政策的～。It is the cornerstone of China’s foreign policy to strengthen its unity and cooperation with other Third World countries./大西洋聯(lián)盟一直是美國政策的～。Atlantic alliance remains the keystone of US policy./教育是中國發(fā)展的～。Education is the bedrock of China’s development.