Mining companies are struggling to increase iron ore output in Australia, the world's biggest exporter, while the quality of Chinese domestic iron ore production fails to improve.
矿业公司正在艰难地提高全球最大铁矿石出口国澳大利亚的产出，而中国国内开采的铁矿石质量未能改善。
2
India, the world's second-largest exporter, restricted exports earlier this year because of domestic scarcity.
世界第二大棉花出口国印度今年早些时候因国内供应紧张实施了出口限制。
3
When an energy exporter converts its petrodollars at the central bank, domestic spending rises.