This material retains the top or outer membrane of the hide, which contains dense, tight fibres that are water-resistant and supportive.
这种材料保留了动物皮革的顶层或者说外层表皮，这层表皮包含致密、紧绷的纤维，具有抗水和支持性能。
Furnace and back-end enclosure wall all adopt membrane wall structure. The outside of tube wall is insulation material and is covered with trapezoid corrugated outer protection plate.
炉膛及尾部包墙均采用膜式壁结构，管壁外侧为保温材料并罩上梯形波纹外护板。
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