当讲破门而入时，break in和break down有什么区别

　　break down侧重于化学上的分解,同时还有镇压、机器损坏故障、健康状况下降、计划终止等
break up侧重于物理上的分解,同时有精神崩溃、终止、结束、解散的含义。
　　break up 崩溃;分离;解散;结业
　　break down 失败;故障
　　break in 非法侵入，插嘴
　　break out 爆发;突然发生
　　break into 闯入;打断;突然...起来
　　breakthrough（应该是单词）n. 1.【军】突围,突破 2.突破性进展;突破点

　　附break into break in 的例句

　　break into:
　　闯入
　　1. As the President's car arrived, the crowd broke into loud applause.
　　总统的汽车到达时，群众中爆发出热烈的掌声。
　　2. I can't pay the 50p I owe you without breaking into a 5 note.
　　我得把一张5英镑的钞票兑开, 才能把欠你的50便士付给你.
　　3. All this extra work I'm doing is breaking into my leisure time.
　　我目前的这一切额外工作用去了我的闲暇时间.
　　4. His house was broken into (eg by burglars) last week.
　　上星期有人闯入他的房屋（如窃贼）.
　　5. The sunlight will break into different colors through a prism.
　　阳光穿过棱镜时将分解成各种颜色。
　　6. Social duties break into my time.
　　社交应酬占据了我的时间。
　　7. The thieves planned to break into a bank.
　　行窃者计划洗劫银行。
　　
　　break in:
　　vt. 闯入(打断,使习惯于,使驯服,训练成为)
　　1. Burglars had broken in while we were away on holiday.
　　我们外出度假时, 小偷闯入屋内行窃。
　　2. Please don't break in on our conversation.
　　请不要打断我们的谈话。
　　3. There must be a break in the circuit.
　　电路中一定有断路.
　　4. The thieves must have had someone on the inside to help them break in.
　　那伙盗贼一定有内应, 协助他们闯了进去.

break in是及物动词，指的是人；break down指的是精神。
break in
vt. 闯入(打断,使习惯于,使驯服,训练成为)
例句与用法:
1. Burglars had broken in while we were away on holiday.
我们外出度假时, 小偷闯入屋内行窃。

2. Please don't break in on our conversation.
请不要打断我们的谈话。

3. There must be a break in the circuit.
电路中一定有断路.

4. The thieves must have had someone on the inside to help them break in.
那伙盗贼一定有内应, 协助他们闯了进去.

break down:
vt. 打破(减轻,坍塌,彻底失败,精神不支,中止,把分解)

例句与用法:
1. Her health broke down under the pressure of work.
工作的压力把她的身体弄垮了。

2. The telephone system has broken down.
电话系统失灵了.

3. Negotiations between the two sides have broken down.
双方谈判已经破裂.