Because it cannot reach the two constrained conditions, previous forecast value based on time series composition data cannot add up to 1.
由于不能满足成分数据两个约束条件，以往对按时间顺序收集的成分数据预测，其预测值之和不等于1。
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.
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。
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