1. 这是什么词？
词：engine
英英释义：something powerful that causes great changes in society engine 常可以用来表示“可以引发巨大改变的事物”“带动发展的事物”，比如微信就是腾讯的 engine. （这个词语和reverberate /rɪ'vɝbə'ret/很像，有相同的意思）
2 例子：
China is one of the most powerful engines of the world economy.
《纽约时报》在一篇名为 China Rules 的文章中回顾了中国的发展，说到中国社会结构转型时，有这样一段话：
Bureaucrats who were once obstacles to growth became engines of growth.
曾经阻碍发展的官员们，如今成为了发展的核心力量。
最新的一期《经济学人》中也出现了 engine 的这种用法：
The good reason for more powerful firms is the rise of an innovative elite that is an engine of efficiency.
更多巨头公司的出现得益于一批具有创新精神的精英群体的崛起，后者正是效率的驱动引擎。
3翻译
过去几年投资是中国经济的引擎，现在主要是消费在拉动中国经济。
Investment has been the engine of Chinese engines in the past years, but now is the mainly driven to improve Chinese economy.
参考翻译：While investment was the engine of China's economy a few years ago, today it's mainly driven by consumption.
In the past few years, China's economy was driven mainly by investment, whereas today its engine is consumption.
4 造句
The United Kingdom is one of the most powerful engines of the world education
In the past years, learning English was driven mainly by communication , whereas today its engine is seeing the world.
