The fire was due to the rupture of a high pressure product line.

火灾原因是一条高压生产线的破裂。

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Step 4: Continuous pressure until the feet of the rupture.

步骤4：持续压直至椅脚破裂。

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Step 4: Continuous pressure until the feet of the rupture.

步骤4：持续压直至椅脚破裂。

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