发达的英文：
developed (country, etc.)
flourishing
develop

参考例句：

The undeniable fact is that the amount of advertisement and economical development is directly proportional.
不可否认的事实是﹐广告的多少是和经济发达的程度成正比的。

Industry and commerce are flourishing.
工商业很发达。

Education thrives; industries thrive.
教育发达;工业昌盛。

"Witness The Fat Tat Rubber Co., Singapore."
发达橡胶公司

A highly developed system of agriculture
十分发达的农业体系

His business seems to be flourishing.
他的生意看起来兴隆发达。

"In Singapore, education is widespread and few are illiterate."
看看新加坡，教育发达，文盲极少。

The more he prayed to prosper,the more he went down the wind.
他越祈祷发达，越是陷入困境。

So, to build socialism it is necessary to develop the productive forces.
所以，搞社会主义，一定要使生产力发达

Advances in medical science have made it possible to cure many so-called obstinate illnesses.
医学的发达，使很多所谓痼疾都能治好。

developed是什么意思：
adj. 先进的；发达的

development parameter
发展参数；发展规范

development of gas
放出气体；放出毒气

Coordinate economic development with social development
把经济发展和社会发展结合起来

country是什么意思：
n. 国家；乡村，田野；区域
adj. 乡下的，乡村风味的

The country was in ferment.
那个国家处于动乱中。

It is the trademark of the country.
它是该国的标志。

This is an agricultural country.
这是个以农业为主的国家。

etc是什么意思：
abbr. (= et cetera) 及其他，等等

Put(beads,etc)on a thread,etc
将(珠子等)穿在线等上

(of cheeks,etc)hollow as a result of hunger,illness,etc
(指面颊等)(因饥饿、疾病等)凹陷的

(of people,behaviour,etc)displaying selfishness,meanness,etc
(指人、行为等)自私自利的,卑污的,龌龊的