FOOD 食物, [C,U] a thick sweet substance made from boiled fruit and sugar, eaten especially on bread

果酱;

strawberry jam

草莓酱

a jam sandwich

果酱三明治

jam jars

果酱罐

CARS / PEOPLE 汽车/人, [C] a situation in which it is difficult or impossible to move because there are so many cars or people

拥挤; 堵塞:

Sorry we're late. We got stuck in a traffic jam .

对不起，我们来晚了，路上堵车。

MACHINE 机器, [C] a situation in which a machine does not work because something is stopping a part from moving

卡住，不能运转:

It caused a jam in the printer.

这导致打印机卡纸。

DIFFICULT SITUATION 困境, [C usually singular] [informal] a difficult situation

困境:

We became friends after he helped me out of a jam.

他帮助我摆脱困境后，我们就成了朋友。

MUSIC 音乐, [C]

kick out the jams, [AmE informal] to play ROCK MUSIC loudly and with a lot of energy or emotion

狂热地演奏摇滚乐:

jam tomorrow, [BrE informal] good things someone promises you, which never happen

空头许诺，许而不予的好东西:

There is an element of 'jam tomorrow' about some of the government's policies.

政府的有些政策有点像美好的空头许诺。

PUSH HARD 用力推, [T always + adv / prep] to push something somewhere using a lot of force, until it can move no further

用力推挤; 硬塞:

He jammed his foot on the accelerator and the car sped off.

他使劲踩下油门，汽车飞驰而去。

A chair had been jammed up against the door.

门用一把椅子顶住了。

MACHINE 机器, [I,T] also jam up if a moving part of something jams, or if you jam it, it no longer works properly because something is preventing it from moving

（使）卡住;（使）不能运转:

The front roller has jammed on the photocopier.

复印机的前滚筒卡住了。

BLOCK 堵塞, [I,T] also jam up if a lot of people or vehicles jam a place, they fill it so that it is difficult to move

〔人或车〕挤满; 挤进;

Crowds jammed the entrance to the stadium.

体育场入口处挤满了人。

They all jammed into the car.

他们全都挤进了这辆汽车。

MUSIC 音乐, [I] also jam out to play music in an informal way with other people

〔和别人一起〕即兴演奏

jam on the brakes, to slow down a car suddenly by putting your foot down hard on the BRAKE

猛踩刹车

jam sb's / the switchboard, if telephone calls jam the switchboard of an organization, so many people are phoning the organization that it cannot deal with them all

使某人的电话总机应接不暇:

Viewers jammed the switchboard with complaints.

观众打电话来投诉，总机应接不暇。

RADIO 无线电, [T] to deliberately prevent broadcasts or other electronic signals from being received, by broadcasting signals on the same WAVELENGTH

干扰〔无线电广播或其他电子信号〕

sb is jamming, [AmE spoken] used to say that someone is doing something very quickly or well

某人干得真快（好）