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. This type of sheet steel could stand high pressure. 
   这种钢板能抗高压。
3. usually galvanized sheet iron or sheet steel shaped into straight parallel ridges and hollows. 
   通常是指外形上带有平行的突起和凹陷的白铁钢板。
4. We use the machine to pierce hole in the steel sheet. 
   我们用机器在钢板上打洞。
5. thin sheet iron or steel coated with tin to prevent rusting; used especially for cans and pots. 
   外表涂锡以防生锈的薄铁片或钢片；在罐头或陶器中尤其常用。

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