然而，不确定的主要来源在供应这边，特别的，亚洲大量计划的新工厂的困难前景。
The chief source of uncertainty, though, is on the supply side-in particular, the troubled outlook for a host of planned new plants in Asia.
为了满足需求，中国不得不将目光转向境外，而非洲是一个主要的供应来源。
To satisfy its demand, China has to look abroad, and Africa is a key supplier.
铅冶炼厂可以几乎全部使用报废的汽车电池作为它们的主要的铅的供应来源。
Lead smelters may use almost entirely scrap automotive storage batteries as their essential lead supply.
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