The animal retracted into its shell.

这只动物缩回到自己的壳里。

《牛津词典》

The snail retreated into its shell.

蜗牛缩进壳里去了。

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Nearby, a box turtle shuffled through the fallen leaves and hissed into its shell when I sat up to take a closer look.

不远处，一只箱龟慢吞吞地在落叶间爬行，我坐起来想看个清楚，它就咝咝地缩进壳里去了。

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The investing class has instead pulled its collective head back into its weathered shell and mentally retreated back to the (relative) safety of looking at their own homes as a preferred investment class.

FORBES: Americans Hate Stocks

The FSA has finished its inquiry into Shell the company, but it too may now scrutinise the behaviour of individual managers.

ECONOMIST: A damning verdict | The

P3 folds up for easy storage, and stows away into its own compact hard-shell carry case.

ENGADGET: Bowers & Wilkins kicks out P3 headphones, brings upscale sound to the commoners (update)