It rained every day while I was in Shanghai.
我在上海时，天天下雨。
We are hoping to introduce the history and future of Shanghai while operating the business.
希望在商业经营的同时，也可以将上海的新貌和历史向广大顾客介绍。
I took the opportunity of visiting my aunt while I was in Shanghai.
我利用在上海的机会探望了我的姑姑。
I actually wrote Shanghai while I was in Shanghai a few years ago.
我实际上就在旅程中于几年前写了Shanghai。
Shanghai has the most obvious advantage, while exhibition industry in Beijing is very stable;
展览市场运行质量良莠不齐，上海优势特征明显；
Shanghai has the most obvious advantage, while exhibition industry in Beijing is very stable;
展览市场运行质量良莠不齐，上海优势特征明显；
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