1941年，火车本可以由蒸汽机车拉动。In 1941, the train would have been pulled by a steam engine.在发电厂里，热能将水转化成高压蒸汽。In an electric power plant the heat converts water into high-pressure steam.突然，滚滚蒸汽从发动机里冒了出来。Suddenly, clouds of steam star...
Grease two sturdy baking sheets and heat the oven to 400 degrees.在两块结实的烤板上抹些油，把烤炉加热到400度。There was a sturdy plumpness about her hips.她的臀部浑圆结实。a sturdy pair of boots一双结实的靴子...