The index works by taking a weightedaverage of the price of imported iron and domestically produced iron ore to produce a composite number.
这种指数通过对进口铁和国产铁矿石取以加权平均价格以此产生一个合成数。
2
The Dow is a relic of a market indicator; an average, not an index, weighted by price, not by market value.
道指是业已过时的市场指标；它是平均数，而非指数；以市价而非市值为权重。
3
And Australia's official index, a weightedaverage of prices in eight capital cities, was boosted by booms in Perth (up by 36.9% in the year to the fourth quarter) and Darwin (17.6%).