直边和弯边的封边材料 edgebanding materials for straight and softforming edges 群的直和 Direct sum of groups ; Weak direct product 弱直和 weak direct sum ..
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一群群政府士兵、叛乱分子和纯属一般的罪犯一直在一些街区里游荡。
Bands of government soldiers, rebels and just plain criminals have been roaming some neighbourhoods.
自五月份博物馆开馆后，工人们还一直在成堆的泥土和瓦砾中敲敲打打，为建筑群余下部分的建设做准备。
Months after the museum's opening in May, workers are drilling and hammering amid piles of dirt and rubble to prepare the rest of the complex.
一片神秘的庙宇和玛雅金字塔群坐落在墨西哥和危地马拉丛林深处，并一直延伸到尤卡坦半岛。
Deep within the jungles of Mexico and Guatemala and extending into the Yucatan peninsula lie the mysterious temples and Mayan pyramids.
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