与此同时，将有更多的道路和地下层建成，减少交通拥挤。

At the same time, more roads will be built and the underground will be added, reducing heavy traffic.

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该协会还表示，必须提高机组人员和空中交通管制员的培训标准，因为空中交通越来越拥挤。

The association also said that standards of training must be raised among flight crews and air traffic controllers as the sky has become ever more crowded.

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例如，在该豪华汽车公司中，旅行MC可能订阅那些报告旅行调度、乘客上车、乘客下车、交通拥挤和汽车事故的事件。

In the limo company example, the trip MCs might subscribe to events that report trip dispatching, passenger pick-up, passenger drop-off, heavy traffic, and car incidents.

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