a partly enclosed directly heated surface from which warm air circulates by convection
部分封闭的直接加热的表面，热空气通过对流从其上循环
以上为机器翻译结果，长、整句建议使用 人工翻译 。
A partly enclosed, directly heated surface from which warm air circulates by convection.
对流式加热机一个部分被封闭。
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