身體的自動防守
最容易看見的一支：反應就發生在身上，看得到也感覺得到。
noun · B2
A reaction in the body that protects it from illness or harm, such as a cough that pushes dust out or a fever that fights germs.
（生理）防禦機制
核心畫面
You can picture a guard that was never switched on by anyone and never has to be told. Something dangerous comes near, and the guard moves on its own: the body coughs, or the mind puts a memory out of reach. Both uses share that one shape — automatic, protective, and not chosen.
defence mechanism 可以想成「一個沒有人去開、也不用交代的守衛」。危險靠近的時候，它自己就動了：身體…更多收起
defence mechanism 可以想成「一個沒有人去開、也不用交代的守衛」。危險靠近的時候，它自己就動了：身體咳出來，或是心裡把一段記憶推到拿不到的地方。兩個意思共用這個樣子——自動發生、目的是保護、不是誰決定的。Two branches
心裡的自動防守
同一個守衛換到看不見的地方：擋掉的不是細菌，是太痛的念頭。這是兩個意思之間的理解方式，不是說哪一個先出現、由哪一個長出來。
noun · B2
Something the mind does by itself to keep painful thoughts away from you, such as pushing a memory you cannot bear out of reach so that you stop thinking about it.
（心理）防衛機制