名詞 break down:

1. the act of disrupting an established order so it fails to continue
   同義詞：dislocation, breakdown
2. a mental or physical breakdown
   同義詞：breakdown, crack-up
3. a cessation of normal operation
   同義詞：breakdown, equipment failure
4. an analysis into mutually exclusive categories
   同義詞：breakdown, partitioning

動詞 break down:

1. make a mathematical, chemical, or grammatical analysis of; break down into components or essential features
   同義詞：analyze, analyse, dissect, take apart
2. make ineffective
   同義詞：crush
3. lose control of one's emotions
   同義詞：lose it, snap
4. stop operating or functioning
   同義詞：fail, go bad, give way, die, give out, conk out, go, break
5. separate (substances) into constituent elements or parts
   同義詞：decompose, break up
6. fall apart
   同義詞：crumble, crumple, tumble, collapse
7. cause to fall or collapse
8. collapse due to fatigue, an illness, or a sudden attack
   同義詞：collapse

1. He broke down and wept when he heard the news.
   他聽到這個消息時不禁痛哭起來。
2. Negotiations between the two sides have broken down.
   雙方談判已經(jīng)破裂。
3. Expenditure on the project breaks down as follows: wages 10m, plant 4m, raw materials 5m.
   該工程費用開支可分成如下幾部分: 工資一千萬英鎊，廠房設(shè)備四百萬英鎊，原料五百萬英鎊。
4. The telephone system has broken down.
   電話系統(tǒng)失靈了。
5. Firemen had to break the door down to reach the people trapped inside.
   消防人員須破門而入，才能搶救困在屋里的人。
6. If law and order break down, anarchy will result.
   法治一垮，就會出現(xiàn)無政府狀態(tài)。
7. We (ie Our car) broke down on the motorway.
   我們(的汽車)在高速公路上拋錨了。
8. Her health broke down under the pressure of work.
   工作的壓力把她的身體弄垮了。