其中两个基本保护层旨在抵抗爆炸中产生的两类主要威胁：超压脉冲，或者叫冲击波；

These two fundamental layers are designed to defeat the two main threats in an explosion: the overpressure pulse, or shockwave;

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其中两个基本保护层旨在抵抗爆炸中产生的两类主要威胁：超压脉冲，或者叫冲击波；以及通常由弹片构成的碎片伤害。

These two fundamental layers are designed to defeat the two main threats in an explosion: the overpressure pulse, or shockwave; and the fragmentation, commonly known as shrapnel.

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