"an engine of change"
以上来源于: WordNet
N-COUNT The engine of a car or other vehicle is the part that produces the power which makes the vehicle move. 引擎
He got into the driving seat and started the engine.
他坐上驾驶座椅,发动了引擎。
N-COUNT An engine is also the large vehicle that pulls a train. 机车
In 1941, the train would have been pulled by a steam engine.
1941年,火车可能已由蒸汽机车来牵引了。
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