您可以充分利用已有的基础设施。
You can take full advantage of infrastructure that you may already have in place.
其他的一些商品比如木材,每年净增长3%(在已有的基础上)。
Other commodities such as timber rise at 3% a year "real" (above the rate of calculated inflation).
这个数字很巨大因为这种增长通常是排除了已有的基础(这是错误的)。
That's largely because such rises are (wrongly) excluded from the calculation.
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