You can think of a brigade as a band of people who are organised to act together: they have roles, they train, and when a call comes they move as one body. Put fire in front of it and the picture is fixed on one job — going towards the smoke while everyone else goes away from it. Both meanings of fire brigade are that same picture; what changes is who the people are and whether this is their paid work.
「brigade」可以想成一支編好隊的人馬：有分工、有訓練，接到通知就整隊一起動。前面加上 fire，畫面就定在一件事上——別人往外跑的時候，這群人往煙的方向走。fire brigade 的兩個意思都可以放進這張圖裡。不同的地方只在於：這群人是誰，還有救火是不是他們的正職。
登入就可以看每一支怎麼連回核心畫面。