downward-facing heated surface

• 面朝下加热

downward-facing heated surface的用法和样例：

例句

1. When they are heated under pressure the constituents fuse together.
   在压力下加热，这些成分熔合在一起。
2. The structure alteration of the lignin treated with saturated steam is more than that heated in dry condition.
   与用水蒸气加热处理相比，在干燥条件下加热后木素结构变化相对较小。