胸式安全带，用于连接座式安全带，以保证坠落时身体直立。也用于在携带重物下降时支撑身体。

Chest harness - a harness used in conjunction with a seat harness to keep the body upright in case of a free fall (into a crevasse, for instance).

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那个人双手抱胸，像一座青铜雕塑直立在那里。

The man, arms folded over his chest, stood straight up like a statue of bronze.

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