top bottom meaning in Chinese

煤层下分层的上部

Top bottom sill glass finished stainless steel
上下坎：镜面不锈钢压筋
Please ensure that this door is closed top bottom
请确保此门上下关紧
Top bottom cover powder coated steel plate
上下罩：钢板烤漆压筋
Top bottom cover reinforced plastic glass with top and bottom decoration
增强型玻璃彩色上下装饰罩
Thickness : side board front board at 8mm , top bottom board at 5mm 3mm
厚度:边机板面板8mm ,上盖板

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