前后弧焊 tandem arc weld ; tandem welding
前冲弧圈球 accelerated loop ; fast loop drive
弧前 [海洋] fore-arc
弧前盆地 [海洋] fore-arc basin ; forearc basin
前缘弧区 frontal arc terrane
岛弧前缘 arc front
颈前低位弧形切口 Low cervical collar curved incision
前冲弧圈 speed drive ; loop drive
弧前区 forearc area
弧后陆前盆地 retro arc foreland basin
南海地区新生代沉积盆地有四类：张裂盆地、走滑拉张盆地、前陆盆地和前弧盆地。
There have four kind of basins in the South China Sea area: rifting basin, strike-slip rifting basin, fore-land basin and fore-arc basin.
沉积物被从两侧的弧前脊和岛弧冲到盆地，使该处地壳承重增加，形成洼地。
Sediments washed into the basin from both the fore-arc ridge and island arc weigh down the crust in this area, creating the depression.
在晚古生代岛弧带、弧前海沟带、弧后盆地或陆缘活动带等构造环境下发育有不同的火山岩组合。
Under the tectonic backgrounds of island arc belt, fore - arc trench belt, back - arc basin, and epicontinental active belt of late Paleozoic, it has different volcanic rock characteristics.
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