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steam; vapour; vapor
steamboat; steam locomotive
鍋の蓋を開けると蒸汽が一気に上がった。
When I lifted the lid, steam rose all at once.
蒸汽機関車が白い煙を吐いて走っていく。
The steam locomotive runs along puffing out white smoke.
蒸汽で曇った窓ガラスに指で絵を描いた。
I drew a picture with my finger on the window fogged up by steam.