This is the shell model.

这就是核壳模型。

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Traditionally, new processors have arrived on the iPad and then, after extensive user testing, squeezed into the shell of the next model iPhone.

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The battery is located within a carbon-fibre monocoque which forms an integral part of the body shell and acts as the gullwing model's "spine".

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While Shell was once seen as a model of good management, some investors have in recent years criticised its complicated two-company structure: Royal Dutch Petroleum, based in the Netherlands, owns 60% of the group and London-based Shell Transport and Trading the remaining 40%, with operational management reporting to both boards.

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