the number of vehicles moving along roads, or the amount of aircraft, trains, or ships moving along a route

There was heavy/a lot of traffic on the roads this morning. 今天早晨道路上车流量很大。

We got stuck in traffic for several hours. 我们碰上交通阻塞被堵了好几个小时。

New measures have been introduced to try and ease traffic congestion in the city. 这个城市已经采取了新措施，试图缓解交通拥堵。

Five people were injured in a traffic accident (= one involving vehicles). 有5人在交通事故中受伤。

US I heard about the accident on the traffic report on the radio this morning. 我在今早电台的交通节目中听到了这起事故。

Air traffic has increased 30 percent in the last decade. 在过去的10年里，空中交通量增加了30%。

people or goods transported by road, air, train, or ship, as a business

The airline halved its overseas service because of a sharp reduction in traffic. 该航空公司因运输量骤降而削减了一半的海外业务。

Environmental groups want more passenger and freight traffic moved off the roads and onto trains. 环保团体想要把更多的客运和货运业务从公路转移到铁路上。

illegal trade

to cut down the traffic in drugs/the drug traffic 打击毒品买卖

Police are looking for ways of curbing the traffic in guns. 警方正在想方设法遏制非法枪支交易。

the activity of data and messages passing through an online communication system or the number of visits to a particular website

internet traffic 网络流量

Twitter traffic 推特的流量

web/website/site traffic 网络/网站/站点的流量

We can give you advice on how to improve your site traffic and generate sales. 我们可以为您提供有关如何增加网站流量和提升销售量的建议。

to buy and sell goods illegally

They were arrested for trafficking in the eggs of protected species of birds. 他们因非法交易国家保护鸟类所产的蛋而被捕。

to illegally buy or sell people, or make money from work they are forced to do, such as sex work

It is estimated that between 700,000 and 2 million women and children are trafficked globally each year. 据估计全球每年有70至200万妇女儿童被贩卖。