然而，新的交易型开放式指数基金的特殊目的在于将铜从一个已经供不应求的市场里退出，使投资者和工业用户直接参与供应竞争。
Yet the express purpose of the new ETFs is to take copper off a market that is already tight, bringing investors and industrial consumers into direct competition for supplies.
他很快了解到市场的情况：目前草饲料产品供不应求。
He quickly learned what the market has demonstrated: Demand for grass-fed products currently exceeds supply.
当世界天然气市场供不应求，对于欧洲能源安全的担忧应运而生。
The big worries over European energy security came when the world gas market was tight.
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