traffic jam的复数形式怎么写？

n.塞车...

A 25 mile traffic jam clogged the northbound carriageway of the M6.长达25英里的交通拥堵阻塞了M6号高速公路的北行车道。She sat in the car, silently fuming at the traffic jam.她坐在汽车里，心中对交通堵塞感到十分恼火。We were stuck in a traffic jam .我们遇上了交通阻塞。...

traffic jam的音标：traffic jam的英式发音音标为：['træfik dʒæm]traffic jam的美式发音音标为：['træfɪk dʒæm]...