铜的供给很难增大,所以其价格增长势头很大。
The momentum of copper, whose supply is harder to ramp up, looks more resilient.
抛开统计因素不谈,即使劳动生产率获得提高,面对美国经济身上日益增大的压力,经济产出仍有可能无法维持目前良好的增长势头。
Statistics aside, it is also possible output won't hold up under the pressures building against the U. S. economy, even with better productivity.
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