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adj.最好的；第一流的；优秀的；adv.最好地；第一流地；优秀地； 英英释义： first-class[ 'fə:st'klɑ:s ]n.the highest rank in a classification同义词：first classmail that includes letters and postcards and packages sealed against inspection同义词：first class1st classfirst-class mail1st-class mailt
