数百艘船的钢壳在冰冷的北大西洋中裂开，其中12艘船裂成两半沉没。

The steel shells of hundreds of the ships cracked in the icy north Atlantic, and 12 broke in half and sank.

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每块阿伦德碎片样本都覆盖着一层黑色的、玻璃样的熔壳，这层熔壳是在它们的外表面与地球大气层摩擦减速中熔化形成的。

Individual specimens of Allende are covered with a black, glassy crust that formed when their exteriors melted as they were slowed by Earth's atmosphere.

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水合壳在十二烷基苯磺酸钠（SDBS）头基与阳离子之间的相互作用中起着重要作用。

The hydration shell plays an important role in the interactions between the sodium dodecyl benzene sulfonate(SDBS) headgroup and the cation.

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Step three in our Lewis structure rules is to figure out how many electrons we would need in order for every single atom in our molecule to have a full valence shell.

路易斯结构规则的第三步是,找出让分子中每个原子的价壳层,都排满应该需要多少个价电子。

麻省理工公开课 - 化学原理课程节选