engine
英英释义：something powerful that causes great changes in society.
例句：China is one of the most powerful engines of the world economy.
” engine “ 是”引擎“ ” 发动机“的意思，常用来表示可以引起巨大改变的事物” 带动发展的事物“， 比如微信就是腾讯的engine
《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是：
Bureaucrats who were once obstacles to growth became engines of growth. 曾经阻碍发展的官员们，如今成了发展的核心力量。
最新一期的《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。
作业
1. 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 was the engine of China's economy a few years ago, today it's primarily driven by consumption.
- 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.
2. 造句
～场景：创新产品是Apple最强大的引擎
～造句：Innovative products is the most powerful engine of Apple.
