Many residual arcs and back arc basins exist between the frontal arc and Eurasia continent.

介于前缘弧和欧亚大陆之间的是众多的残余弧和弧后盆地。

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The late Permian it was changed into the back arc basin, and transformed into foreland basin.

晚二叠世末，该地区变成弧后盆地，进一步转化成前陆盆地。

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The first one is back arc basin sediment in margin of back arc during Jixian Period-early Qingbaikou Period.

第一构造层为蓟县纪—青白口纪早期弧后边缘盆地沉积。

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Yes, it feels good in the hand, owed in part to that matte plastic back and subtle arc S-like curve, but the materials feel cheap.

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