Tā gǎnjué zìjǐ zhǐ shèng xià yī jù xíngzǒu de qūké.
He felt as though all that was left of him was a walking shell.
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usage
躯壳 is a philosophical or literary term contrasting the physical body with the soul (灵魂). It implies the body is merely a container, and is common in reflective or poignant contexts.