随着穷国们逐渐富裕起来，对这些矿物的需求可能会激增。
Demand for all of these minerals is likely to surge as poor countries get rich.
人们日渐富有，家庭便逐渐缩小；而家庭缩小了，人们也就越来越富裕。
When people got richer, families got smaller; and as families got smaller, people got richer.
人们日渐富有，家庭便逐渐缩小；而家庭缩小了，人们也就越来越富裕。
When people got richer, families got smaller; and as families got smaller, people got richer.
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