I saw China as a far more developed country than I believed it would be.

与我们想象相比，中国是一个更发达的国家。

youdao

China was the first country in the world to cultivate silkworms and develop silk weaving. More than 3,000 years ago, sericulture and silk weaving were already significantly developed.

中国是世界上最早发明养蚕和丝织的国家；早在3,000多年以前，蚕桑、丝织已相当发达。

《新英汉大辞典》

The Senate, the upper house, is expected to endorse it next month, marking a turning point for Australia, which emits more carbon per person than any other country in the developed world.

作为上议院的参议院将于下个月支持该计划，这在澳大利亚这个发达国家中人均碳排放量最大的国家标志着一个转折点。

youdao

They are acting more like their developed country counterparts.

FORBES: Five New Trends of Chinese Consumers

As the first of its kind, the company said the Delabole local tariff was its "blueprint" and would be replicated across the country as it developed more wind farms.

BBC: Delabole wind farm households offered discount tariff

Because it is located in built-up west London, Heathrow already makes more people miserable than just about any other big developed-country airport.

ECONOMIST: Business travel