1）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。
A few years ago, investment was the engine of China's economy while today it's mainly driven by consumption.
2）例子： 微信就像是腾讯的引擎，带动了腾讯的发展。
场景 ：WeChat, an engine of Tencent, is known as China’s “app for everything” and a “supper app” because of a wide range of functions and platforms.
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