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boiler
工場の罐が古くなって交換が必要だ。
The factory's boiler has gotten old and needs replacing.
罐の圧力を定期的に点検しなければならない。
The boiler pressure must be checked regularly.
蒸気機関車の罐に石炭をくべていた。
They were feeding coal into the steam locomotive's boiler.