The physical core is crystallized in magnetic iron-nickel alloy-composite. The core is not hollow.
物质核心是磁性铁镍合金复合材料的结晶,其核心不是中空的。
2
The riser's inner hollowcore (a pipe within a pipe) is reserved for the drill string.
立管内部核心是空心的(管中管),留给钻柱使用。
3
Simple and enormous intersecting walls give a balanced symmetry but are also the means by which the structure stands at the height of a 14-storey building, with an entirely hollowcore.