单词	grinds away at
释义	grinds away at 用功于…
随便看	mild steel countersunk head machine screw mild steel damper mild-steel domestic boiler mild steel electrode mild steel mild-steel mild steel angle bar mild steel arc welding electrode mild steel equal angle mild steel expanded sheets mild steel fire box mild steel flat bar mild steel hexagonal bolt mild steel hexagonal bolt and nut mild steel hexagonal bolts mild steel hexagonal bolts and nuts mild steel hexagonal nut mild steel hexagonal socket screw mild steel I-beam mild steel ingot mild steel joist mild steel link chain mild steel machine screw mild steel oval bar mild steel plate