在各主要金属中，铜的供应最为紧缺。矿石质量下降、南美矿场因劳资关系引发的罢工，以及新矿场难以满足预期需求等因素，都在制约着铜的供应。
Copper is the most supply constrained of the main metals, as ore quality declines, South American mines suffer industrial relations strife and new mines fail to meet forecast demand.
这些企业有时会因收入待遇工作条件、工作时间等问题，以及其他一些管理 问题的出现，而产生劳资纠纷。
Occasionally disputes have arisen between labor and management in some of these enterprises on matter of pay and benefits, wording conditions, hours of work and other management issues.
这些企业有时会因收入待遇工作条件、工作时间等问题，以及其他一些管理问题的出现，而产生劳资纠纷。
Occasionally disputes have arisen between labor and management in some of these enterprises on matter of pay and benefits, wording conditions, hours of work and other management issues.
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