to come on stream
(start operating)new factory, new system +开始运行；启动；投入使用
As new mines come on stream, Chile's share of world copper output will increase sharply.矿投产后, 智利在世界铜产量中所占的份额将大幅增加。
(become available)可用；存在
More new apartments will come on stream soon.很快就会有更多的新公寓。