Kurt kept to the inner surface of the spiral, avoiding the darkness that lay beyond.
库尔特留在螺旋的内表面，避开超出去的黑暗部分。
The 5 miniature heat pipes have different wick structures including the inner spiral grooved, wire meshes, inner spiral grooved with wire meshes, sintered metal powders, and smooth surface.
五种热管带有不同吸液芯结构：微肋、丝网芯、加网芯微肋、金属粉末烧结芯及光滑表面。
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