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1·A shell fragment ripped open his right arm while he was swimming.

在游泳时碎贝壳划破了他的右臂。

2·A type of secondary porosity created through the dissolution of a preexisting constituent of a rock, such as a shell, rock fragment or grain.

一种通过先存岩石组分(如生物介壳，岩屑或岩石颗粒)的溶解所造成的次生孔隙类型。

3·The fragment velocity depends on local thickness of shell, the thicker or the heavier is the local shell, and the bigger the influence of shell on shock wave intensity is.

破片速度与壳体厚度有关，壳体越厚或质量越大，对空气冲击波强度的影响越显著。