These include Tehran (which produces 40% of national GDP), Dhaka (60%), Mexico City (40%), Seoul (50%) and Cairo (50%).

这种国家包括德黑兰（占全国GDP总额的40%）、达卡（60%）、墨西哥城（40%）、釜山（50%）以及开罗（50%）。

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This is naturally more difficult to do, however, if small and medium-sized businesses have maxed out on growth in the U.S., as described in my new book, Export Now, co-authored with Frank Lavin, they might consider seeking new sales in markets that are similar to the ones they already understand perhaps, these include Canada or Mexico.

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