定义了上三角等次对角线矩阵和上三角交错次对角线矩阵；
This paper defined up-triangle equal minor diagonal matrix and up-triangle stagger minor diagonal matrix.
她说：“在伊洛瓦底江三角洲，由于那里数百条河流、数百个小岛星罗棋布，纵横交错，一些地方只能乘船和橡皮船才能进去，救援物资运送的困难可想而知。”
"In the Irrawaddy Delta, we have a logistical nightmare because of those hundreds of rivers, hundreds of small islands and... some places are only reachable by boat, inflatable boats," Byrs said.
河流从这个三角洲流入卡拉·哈里沙漠的一个盆地，形成纵横交错的咸水湖、河道及岛屿，在那里，野生动植物比比皆是，即使在极为干燥的季节，草木依然丰茂。
The delta forms where the river empties into a basin in the Kalahari Desert, creating a maze of lagoons, channels and islands where vegetation flourishes, even in the dry season, and wildlife abounds.
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