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The empty shell of a snail or clam may be left behind, and if it is sufficiently durable and resistant to dissolution, it may remain basically unchanged for a long period of time.

蜗牛或蛤蜊的空壳可能会被留下来，如果足够持久和抗溶解，它可能会在很长一段时间内基本保持不变。

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This organization is but a empty shell.

这个机构形同虚设。

《新英汉大辞典》

Worse, the bug disabled essential instructions that tell the PC how to start-up, effectively reducing machines to an unusable empty shell.

CNN: FROM THE WEB

The man Tengo saw before him was nothing but an empty shell.

NEWYORKER: Town of Cats

Whether a Landesbank could hive off its domestic activities into a private venture and leave the public part an empty shell is questionable.

ECONOMIST: German public-sector banks: Slow progress | The