1. 释义
engine
e.g. Something powerful that causes great changes in society
e.g. China is one of the most powerful engines of the world economy.
“引擎”——“可以引发巨大变化的事物”
2. 翻译&造句
（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 has been the engine of China's economy for the past few years, but now consumption engines China's economy.
参考例句：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：走出小城市的信念驱动着他刻苦学习。
His strong belief of going out is the main engine for him to study hard.
