engine
something powerful that causes great changes in society
例句：China is one of the most powerful engines of the world economy.
1）翻译下面的句子：
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 in the past few years, but now, it's mainly driven by consumption.
参考翻译：While investment was the engine of China's economy a few years ago, today it's mainly driven by consumption. 或 In the past few years, China's economy was driven mainly by investment, whereas today its engine is consumption.
2）场景：年轻人成为推动社会进步的主要力量。
造句：Younth became engines of the social progress.
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