back up的词典解释是:支持,证实(某种说法)If someone or somethingbacks up a statement, they supply evidence to suggest that it is true。back up的例句是用作不及物动词(vi.)Because congestion prevents ships heading back to pick up new cargoes, it has helped to push prices up further.由于拥堵使船只难以返回运载新的货物,起到了进一步推高价格的作用。back up的读音是英[b?k?p];美[b?k?p]。