jam是不可数名词。jam可作名词和动词，作为名词时，中文翻译为果酱、拥挤、堵塞、卡住；作为动词时，中文翻译为使劲挤、卡住、不能动弹、不能运转、塞入、塞进、挤进。
jam的中文意思及用法介绍
1、作为名词时，意为果酱;拥挤;堵塞;卡住(因而发生故障)。
例句：As fans rushed to leave, jams formed at all the exits.
因球迷都急于离开，所有出口都给阻塞了。
There's a paper jam in the photocopier.
复印机卡纸了。
They were in a real jam, Bob thought glumly.
他们确实遇上麻烦了，鲍勃闷闷不乐地想。
Cut the cake in half horizontally and spread jam on one half.
把蛋糕横切成两半，把果酱涂在半面上。
2、作为动词时，意为使劲(往某处)挤(或压、塞);(使)卡住，不能动弹，不能运转;塞入;塞进;挤进。
例句：He jammed his fingers in his ears.
他用手指使劲堵住耳朵。
There's a loose part that keeps jamming the mechanism.
有个零件松了经常卡住机器。
Six of us were jammed into one small car.
我们六个人被塞进一辆小汽车里。
Viewers jammed the switchboard with complaints.
打电话投诉的观众使总机应接不暇。
The car skidded as he jammed on the brakes.
他紧急刹车，汽车向侧边打滑。
He picked his cap up off the ground and jammed it on his head...
他从地上捡起帽子，猛地扣到头上。
