1. U 果酱　very thick sweet liquid made from fruit boiled and preserved in sugar
2. C 拥挤，堵塞　crowding together of people, things, etc. so that movement is difficult or impossible
3. C 困难的处境；窘境　difficult or embarrassing situation

　the traffic ～　交通阻塞
　the ～ jar　果酱罐
　be in〔get into〕 a ～　陷入困境
　get out of this ～　摆脱困境

　Sorry, we're fresh out of jam.　对不起，果酱刚用完。
　The knives and forks were kept in a large jam jar.　刀叉原来放在一个果酱罐里。
　The traffic jam interrupted the flow of the cars.　交通阻塞中断了小车的行驶。
　There was such a jam of people that we couldn't get in.　由于人多拥挤，我们无法进入。
　He's in an awful jam over his marriage.　他因婚事而陷入極大的困境。

 ♣ in a jam
　〈美口〉困境　in difficulty
　I'm in a bit of jam, I haven't got enough money to pay for this meal.　我碰到了一点麻烦，我没有足够的钱来付这餐饭。

1. vt. & vi.（使）塞紧，（使）挤满　 pack, crush, or gather tightly into a small space
2. vt. & vi.堵塞　 fill with people, cars, etc., so that movement is difficult or impossible
3. vt. & vi.发生故障；夹住　 (especially of moving parts, e. g. of machine) to get stuck; squeeze

　～ the enemy stations　干扰敌人的电台
　～ hands　夹手
　～ stores　挤进商店
　～ street　挤上街道
　～ in　（将…)挤进〔塞进〕
　～ on　猛压，猛踩
　～ clothes into a suitcase　把衣服塞进箱子
　～ into a bus　挤进公共汽车
　～ into a lift　挤进一间电梯
　～ with　使…挤满

　The door has jammed.　门卡住了。
　The overheated machine jammed.　过热的机器发生故障了。
　The brakes jammed and the car skidded badly.　刹车出故障，汽车向一侧冲去。
　The brake jammed and the car went into a wall.　刹车发生故障，车子撞入墙内。
　Shoppers jammed the stores at Christmas time.　圣诞节时购物的人挤满了商店。
　Children jammed the entrance to the fun fair.　孩子们把游乐场的入口处挤得水泄不通。
　The crowd jammed the streets and no cars could pass.　马路上人群熙攘，汽车无法通过。
　The parade jammed traffic all over town.　游行队伍阻塞了全市的交通。
　The accident jammed the main road for three hours.　事故使那条主道堵了三个小时。
　The girl jammed her hand when she closed the drawer.　那个女孩在关抽屉时夹了手。
　The authorities were unable to jam this wavelength.　当局无法干扰这一波长。
　They were sent to jam the enemy's radio stations during the war.　战争期间他们被派去干扰敌人的电台。
　The bus was jammed fully.　公共汽车里挤得满满的。
　The ship was jammed between two rocks.　船被夹在两块礁石之间。
　The ship was jammed in the ice.　那条船被夹在冰块里。
　The lid of the box is jammed; I cannot open it.　这只箱子的盖被卡住了，我打不开。
　The broadcasts were jammed by the enemy.　无线电被敌人干扰了。

 ♣ jam in¹　(v.+adv.)
　（将…)挤进〔塞进〕　push, press, or pack things or people tightly in a space
　Crowds jammed in for seats when the train pulled up.　火车一停，人们便挤进车厢找座位。
　You'll have to catch the next bus; we can't possibly jam any more passengers in.　你得坐下辆车，这辆车无论如何也挤不下了。
　My car has been jammed in by several lorries, and I can't get it out.　我的汽车让几台卡车挤住，我开不出去了。
　Don't park there; you'll probably get jammed in.　别把汽车停在那里，你说不定会被堵在里面。
　The bus was so full that I was jammed in and couldn't move.　公共汽车上人太多了，我被挤在里面动弹不得。
 ♣ jam in²　(v.+prep.)
　（将…)挤进〔塞进〕　push, press, or pack things or people tightly into a space
　The logs jammed in the river.　圆木挤塞在河里。
　The girl jammed her fingers in the door.　女孩的手指被门轧伤了。
　He jammed his clothes in a small suitcase.　他把衣服塞进一只小箱子里。
　The key is jammed in the lock.　钥匙卡在锁里，拿不出来。
　The newspapers were so tightly jammed in the letterbox that he could hardly get them out.　报纸紧紧地塞在信箱里，他几乎无法把它们取出。
 ♣ jam into　(v.+prep.)
　（将…)挤进；塞进　push, press, or pack things or people tightly into a space
　Far too many foot-ball supporters tried to jam into the small ground.　太多的足球支持者想挤进那个小场地。
　One of the lifts was out of order, so we all had to jam into the other one.　两座电梯中的一座出了故障，我们大家只好都挤进另一座电梯里去。
　I can't jam another thing into the bag.　这个包里再也塞不下一件东西了。
 ♣ jam on¹　(v.+adv.)
　〔说明〕 jam on常不用于进行体。
1. 使劲地、匆忙地穿戴 put sth on hurriedly and hard
　He jammed on his hat and rushed out of the house.　他把礼帽使劲儿往头上一扣，冲出房子。
2. 猛压，猛踩 use sth hurriedly, as by pressing
　He jammed on the brakes of the car.　他踩紧车闸。
　Although he jammed on his brakes, he still couldn't avoid hitting the dog.　他虽然猛地刹车，但还是撞到了那条狗。
 ♣ jam on²　(v.+prep.)
　猛压，猛踩　use sth hurriedly, as by pressing
　〔说明〕 jam on通常不用于进行体。
　She jammed her foot on the brake.　她用劲将脚踏在刹车闸上。
 ♣ jam together　(v.+adv.)
　（使）紧紧地挤在一起　(cause to) be packed tightly together
　The crowd jammed together to get a good view of the famous visitor.　大家你挤我，我挤你，都想好好看看那位来访的名人。
　The two pieces of wood always jam together if I don't hold them apart.　我要是不把这两块木板撑开，它们就老是挤在一块。
　All the cars were jammed together at one end of the bridge.　所有车辆都挤在大桥的一头。
 ♣ jam up　(v.+adv.)
　〈口〉把事情搞糟，搞乱　 spoil; cause difficulty in sth
　The accident jammed up the traffic for half an hour.　意外事故使交通阻塞了半小时。
　The committee was doing well until the chairman's independent action jammed up the work.　委员会的工作本来进行得很顺利，可后来主席自行其是，把事情搅糟了。
 ♣ jam with　(v.+prep.)
　使挤满　fill a space tightly with sth, things, or people
　The train was jammed with passengers.　火车上挤满了乘客。
　The gateway was jammed with angry people.　大门口挤满了愤怒的人们。
　The room was jammed with people wanting to buy the furniture.　人们挤满了房间，等着买家具。
　The roads are jammed with cars taking people to horse show.　路上挤满了驱车看马展者的车辆。
　The company's switchboard was jammed with complaints.　打来投诉的电话太多了，公司的电话总机应接不暇。