jam有一个不及物动词的意思是“to play music informally with others without practising first”。另外还有一个口语式的用法是sb is jamming(used to say that someone is doing something well)。谁能用这两个意思各造一个句子吗（最好能附上中文解释）？
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jam[dVAm]n。果酱, 拥挤, 堵塞, 困境vt。挤进, 使塞满, 混杂, 压碎, 使堵塞vi。堵塞, 轧住, 拥挤jam[dVAm]n。拥挤的人群; 阻塞物; 塞满(机器等)轧住, 轧伤, 轧碎, 停顿不动[美口]困境, 窘境; 和警察等争执[美俚]举手之劳的事干扰; 失灵a traffic jam交通阻塞jamvi。(jammed; jamming)塞满, 拥挤; 堵塞楔紧; (机器等)轧住不动; 【无】干扰, 失真[美俚]参加爵士音乐演奏会或即兴演出The brakes jammed。刹车失灵了。jamvt。把。。。挤进[塞进]使(机器等)轧住[卡住], 使塞满轧伤; 压碎使(通道等)堵塞; 使挤进【无】干扰jamed herself through the porthole她强从舱口挤了过去jamproofadj。抗干忧的be jammed for time匆匆忙忙be jammed in陷入窘境be jammed with (people)拥挤; 挤满了(人)get into a jam[俚]陷入困境card jam卡片阻塞ice jam【水】冰塞log jam原木阻塞tape jam带阻塞, 带故障traffic jam交通拥挤; 交通阻塞。