Last Updated:2025/11/24

In the old coal mine, workers relied on safety lamps to detect dangerous gases and avoid accidents.

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In the old coal mine, workers relied on safety lamps to detect dangerous gases and avoid accidents.

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古い炭鉱では、作業員たちは危険なガスを検知して事故を避けるために安全ランプを頼りにしていた。

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