We always think of it as one of the most busy cities.

我们一直认为它是世界上最繁忙的城市之一。

youdao

A bicycle 's often far more convenient than a car in busy cities.

在热闹的都市里骑自行车往往比坐汽车方便得多。

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Segway is a quick, simple, and safe way to travel around busy cities.

塞格威是一种快速、简单、方便行经繁忙都市的选择。

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Some are historic sites in the middle of busy cities.

VOA: special.2009.09.28

Unlike the busy cities along the Trans-Siberian, which have undergone rapid change over the last few years due to increased train traffic and an influx of foreign travellers, the towns along the BAM remain part of the land that time forgot, their Soviet architecture virtually unchanged.

BBC: A train to nowhere in Siberia

Right now, many China investors are paying closer attention to second and third tier cities away from the busy, saturated coast.

FORBES: China's Non-Bubble Housing Bubble

It has call-centres in 15 American towns and cities, which are beginning to get very busy.

ECONOMIST: Call centres