正当这些专家环游欧洲时，他们试图更充分地利用烟花的魅力吸引更多观众，其中也包括正在增长的中产阶级。
As these specialists circulated around Europe, they sought to exploit the appeal of fireworks for a wider audience, including the growing middle classes.
我们正在考虑暑假时环游欧洲。
We are considering a tour around the Europe in summer vacation.
有一次，我轻装环游欧洲，随身带着一把原声吉他。
Once, I backpacked around Europe and I brought an acoustic guitar with me.
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