heavy traffic time

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

与此同时，将有更多的道路和地下层建成，减少交通拥挤。

You have some people who are working all the heavy traffic all the time and other people working hardly any traffic, and that doesn't make for good controllers, in terms of keeping up the proficiency.

这么做会导致有人总在交通高峰期工作而另一些人只在交通闲期工作，那样对控制员不好，不利于保持他们的效率。

There might be a delay in getting the reply after you sent your e-mail due to heavy network traffic or outages at some point of time.

在发送电子邮件后，因某时刻的网络流量过大或者断电，很可能会导致回复延迟。