不发达的英语是：underdeveloped。
双语例句：
他的理论不适用于许多不发达的经济体。
His theory was inapplicable to many underdeveloped economies.
2每个士兵都领到了工资，但最初在经济不发达的地区几乎没有什么花钱的地方。
Each soldier received his pay, but in regions without a developed economy, there was initially little on which it could be spent.
3应该通过允许不发达国家使用现代技术来帮助它们。
Underdeveloped countries should be assisted by allowing them access to modern technology.
4最大的损失者将为不发达国家，特别是撒哈拉以南的非洲国家。
The big losers will be the undeveloped countries, especially in sub-Saharan Africa.
5有许多人他们的文化不发达，但他们说的语言绝不是原始的。
There are many people whose cultures are undeveloped, but the languages they speak are by no means primitive.
6人们通常不重视嗅觉的原因是，虽然嗅觉对于动物很重要，但人类的嗅觉是薄弱而不发达的。
The reason often given for the low regard in which smell is held is that, in comparison with its importance among animals, the human sense of smell is feeble and undeveloped.
7在那些基础建设不发达的贫穷国家，这尤其重要。
This is especially important in poorer countries with underdeveloped infrastructure.
8然而，在印度最不发达的地区，这将需要数年时间。
Yet that, in the most undeveloped parts of India, will take years.
9在市场越是不发达，可再生能源就越重要。
Renewable energy becomes more and more important in less and less developed markets.
10比起神户地区，它的人口密度更低，工业也不发达。
The area is less densely populated than around Kobe, and less industrial.