Primary metal imports over the first eight months of 2012 have averaged close to 50,000 tpm month.这句话怎么翻译呀?尤其是“ 50,000 tpm month”

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Primary metal imports over the first eight months of 2012 have averaged close to 50,000 tpm month.
这句话怎么翻译呀?尤其是“ 50,000 tpm month”

2012年头8个月的原料金属进口平均每个月近50000吨
tpm :ton per month.后面的month估计是误写了.