In other markets low prices would force producers to shut mines. Not for cobalt. The price has already fallen below many miners’ break-even point. 麻烦问一下老师,Not for cobalt.是什么意思啊?
Which questions do you not know theanswers to?Which ones do you need more
information on?上面的句子来自2019版人教版高中英语新教材必修一的 Unit 4(p57)。请问句末的介词起什么作用?为什么要加这个介词呢?可以不要吗?