But the populousness of every country must be in proportion to the degree of its improvement and cultivation.

但是，每个国家的人口数量必须与其改良和耕种的程度成正比。

Marco Polo, who visited it more than five hundred years ago, describes its cultivation, industry, and populousness, almost in the same terms in which they are described by travellers in the present times.

五百多年前访问过它的马可波罗描述它的耕种、工业和人口，几乎与现代旅行者描述的相同。

The extent of the market, therefore, must for a long time be in proportion to the riches and populousness of that country, and consequently their improvement must always be posterior to the improvement of that country.

因此，在很长一段时间内，市场的规模必须与该国的财富和人口数量成正比，因此市场的改善必然总是落后于该国的改善。