Agile methodologies emphasize the iteration demo as a primary mechanism to obtain feedback, but beyond this, one other approach warrants reflection.
Aile方法强调以迭代的方式作为获取反馈的主要机制，但是除了这种方法以外，还有另一种方法值得考虑。
When the primary air blast wave from the explosion strikes the ground another blast wave is produced by reflection.
当爆炸引起的入射冲击波触及地面时，由于波的反射便产生另一冲击波。
When the primary air blast wave from the explosion strikes the ground, another blast wave is produced by reflection.
当爆炸引起的入射冲击波触及地面时，由于波的反射便产生另一冲击波。
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