中東這一地區(qū)一直戰(zhàn)亂頻仍。The Middle East has often been a theatre of war.機(jī)器常裸露著，因此事故頻仍。Machinery was often unprotected and accidents were frequent.北匈奴繼續(xù)與漢為敵,不斷侵?jǐn)_邊境,雙方戰(zhàn)爭頻仍.The Northern Xiongnu went on opposing against the Han Dynasty...