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。
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