待车队驶出广州市区，我们很快就进入了广东的农村地区。

As our caravan exited the suburbs of Guangzhou we soon entered rural Guangdong.

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随后利用此方法对广州市区大气中的羰基化合物进行了研究。

Then, the same method was used to study the concentrations of carbonyl compounds in the atmosphere in Guangzhou.

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第二天，我们忙完了当天的工作后，就从佛山转到了广州市区住了下来。

In the second night, we switched to settle in the downtown of Guangzhou, after we finished our daily task.

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