随着城市的不断发展，到处都有建筑工地，但是却没有足够的人来建造它们。

As cities continue developing, there are building sites everywhere, but there aren't enough people to build them.

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随着时间的推移，不断发展壮大、迅速致富的城市中产阶级将会成为相对而言更为重要的利润来源。

Over time the growing urbanised middle class, who are getting richer fast, will become relatively more important for profits.

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