Indeed, a proposed new system for finding miners trapped by an underground collapse is activated simply by hammering on an iron plate with a sledgehammer.
一套只需用长柄锤击打铁板就能起作用的新设备，正被用于发现塌方事故中的被困矿工。
He was hammering an burning red iron sheet. It seems that he was making a knife.
他锤打着烧红的铁片，看样子是在做一把刀。
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