1. The carbon content of mild steel is much lower than cast-steel. 
   软钢的含碳量要比铸钢的低得多。
2. The vault was a small one, but it had a new, patented door. It fastened with three steel bolts and had a timelock. 
   地下室不大，但装有一扇特制的新门，用三个钢制的螺钉固定着，并安有一把时钟号码锁。
3. Hexagonal. Used of hardware. 
   六角形的，用于指金属器具
4. A machine-woven net fabric with hexagonal meshes. 
   六角网眼纱，珠罗纱机器织的有六角形网眼的网纱
5. a screw with a hexagonal hole in the head. 
   针头有六角形的孔的螺丝。

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