3、traffic在指交通量的大小时用heavy或a lot of、little来修饰,不用large或small来修饰。
4、派生词：trafficker n. 商人，贩子，做非法买卖的'人；trafficking n. 人或车等交通流量，不正当生意（走私）。
例句：
1、There has been a decrease in traffic accidents.
交通事故减少了。
2、 Growing online traffic may actually increase sales in stores too.
网上交易量增长也可能促进实体店的销量上升。
3、 There wasn't much traffic so we made good progress.
来往车辆不多，所以我们开得很快。
4、 We're used to the noise from the traffic now.
现在我们已经适应车辆往来的噪音了。
5、There's always a lot of traffic at this time of day.
每天这个时候总是有很多来往车辆。