枪发射时，气体或弹片的向后泄出。

The backward escape of gases or cartridge fragments when a gun is fired.

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在与实验结果对比的基础上，对某建筑小区环境下有害气体连续泄出的扩散迁移过程进行了初步数值计算。

By comparison with the experimental results, a primary numerical calculation was carried out, for which gas diffusion moves around a building when poisonous gas leakage occurred.

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随后，未燃气体从泄爆口泄出，并在外流场与空气混合形成可燃云团。

Then, the combustible gas rushed out and mixed with the oxygen of the air to form combustible cloud.

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