介绍了金昌冶炼厂高电流密度生产阴极铜的实践及取得的成果。

This paper introduces the production practice for copper electrolysis by raising current density in Jinchang Smelter and effects thus achieved.

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实际的强度水平取决于诸如大城市的物理布局、人口密度和生产活动之类的因素。

The actual level of intensity depends on such factors as the physical layout, population density, and productive activities of a metropolis.

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我们面临的挑战是超越现在化学技术从而生产更安全、更便宜、更大能量密度的电池，这将是困难的。

The challenge is to move beyond the present chemistry to produce batteries that are safer, cheaper and have greater energy density. This will not be easy.

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