The string of attacks occurred in quick succession, capped by a fourth explosion early Tuesday outside the headquarters of a joint U. S. -saudi owned company in Riyadh.

这一系列攻击发生的极快，并且周二凌晨利雅得一家美沙合资公司总部外面又发生了第四起爆炸案件。

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The explosion expanding is a tube to tube-sheet joint method that used powder or electric resistance silk(foil), which can produce ultra high pressure via explosion.

爆炸胀接是利用火药或者电阻丝（箔）的瞬间爆炸产生的超高压来完成胀接的，由于爆炸过程十分复杂，目前利用静力学和动力学难以对其进行分析。

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