密集: concentrated, crowded together, intensive, compressed...
中外: Sino-foreign, Chinese-foreign, home and abroad...
恨: to hate, to regret...
英勇: heroic, gallant, valiant...
难点: difficulty...
中央: central, middle, center, central authorities (of a state)...
图形: picture, figure, diagram, graph, depiction, graphical...
起: batch, group...
日新月异: daily renewal, monthly change (idiom), every day sees new developments, rapid progress...
何苦: why bother， is it worth the trouble?...
