First, ore is mixed with coke and limestone.
先把铁矿石和焦碳、石灰石混合在一起。
The limestone absorb impurity from the ore and form a fluid slag which floats on the surface of the heavier molten iron.
石灰石吸咐了铁矿石中的杂质, 形成浮在较重的铁水表面上的流动渣。
limestone cliffs; limestone walls.
石灰岩峭壁; 石灰岩墙
