Question

请把这些中文翻译成英语 急！！

美国的经济发达，经济体系完善，而中国的经济体系正在逐步完善，不时很成熟 谢了

Answer 1

America, as a developed country, has a perfect economic system, while China's is still gradually improving.
我先抛砖引玉一下，基本意思表达了，就是不是很native

Answer 2

U.S. economic development, improve the economy, and China's economies are gradually improving, from time to time is ripe

Answer 3

The United States is a developed country with perfect economic system,while China's economic system is gradually improving.