邊緣上的一道矮牆
同一道牆，兩種工作：一種擋住掉下去的危險，一種擋住外面的視線。英文用同一個字，因為畫面本來就是同一個。
noun · C1
A low wall built along the edge of a roof, a bridge, a balcony or another high place, so that people and things do not fall over the edge.
矮護牆
核心畫面
Picture a wall that only comes up to your chest, running along the edge of somewhere high. It is solid, so you cannot see through it, and low, so you can see over it if you stand up. Two things follow from that shape: nothing goes over the edge by accident, and anyone behind it is out of sight until they choose to look over.
可以想成一道只到胸口的牆，沿著高處的邊緣延伸。它是實心的，所以看不穿；它又很矮，所以人站直就能看過去。這個形狀帶來兩…更多收起
可以想成一道只到胸口的牆，沿著高處的邊緣延伸。它是實心的，所以看不穿；它又很矮，所以人站直就能看過去。這個形狀帶來兩件事。一是東西不會不小心掉出去。二是待在牆後面的人，只要不抬頭，外面就看不到他。這個字的每一個意思，都是在用這兩件事的其中一件。Two branches
從牆後把頭伸出去
這一組不是在講牆，而是在講牆後面那個人的動作。有牆可以躲，才會有「伸出頭」這件事。
noun · C1
To take a risk by saying or doing something in public, when staying quiet would be the safe choice; marked British English in the source.
冒險出頭