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鉄道工事
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Railway construction
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人々の暮らしを支える土木工事Civil works that support people's lives
人々の暮らしを支える土木工事Civil works that support people's lives
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鉄道工事
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Railway construction
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高速道路
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Expressway construction
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舗装工事
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Paving work
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上下水道工事
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Water and sewage works
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