国: country, nation, state, national...
大学: university, college...
加紧: to intensify, to speed up, to step up...
落后: to fall behind, to lag (in technology etc), backward, to retrogress...
株: tree trunk, stump (tree root), a plant, classifier for trees or plants, strain (biology), to involve others (in shady business)...
自然: nature, natural, naturally...
医疗: medical treatment...
相连: to link, to join, link, connection...
取而代之: to substitute for sb, to remove and replace...
夜以继日: night and day (idiom); continuous strenuous effort...
