自从2007年收购加拿大铝业公司遭到惨重损失后，这是力拓首次尝试如此大的收购。
Rio's offer for Riversdale is its first attempt at a sizeable acquisition since a disastrous purchase of Alcan in 2007.
它也觊觎加拿大铝业集团——一个法加铝业公司，但是去年被力拓中标。
It also had its eye on Alcan, a big French-Canadian aluminum operator, but was outbid last year by Rio Tinto.
用来熔解铝的巨大能源需求可由价廉物美且可靠的水力电气满足，这点来看，加拿大铝业公司的资产是相当易用的。
Alcan is a handy asset-the vast amounts of energy required to smelt aluminium are supplied by reliable, cheap hydroelectricity.
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