Picture a stiff board with a metal clip at the top. You push a sheet of paper under the clip, and now it is held: it will not blow away, it will not slide off, and you can write on it standing in a corridor. The paper is not staying there forever — it is being held until you are done with it, and then the next sheet goes under the clip.
可以想成一塊硬板，上面有個金屬夾。你把一張紙塞進夾子底下，它就被固定住了：吹不走、滑不掉，站在走廊上也能寫字。那張紙不會永遠留在那裡——它只是先被夾著，等你用完，下一張再換上去。clipboard 的兩個意思都靠這個「先夾著等你用」的動作在運作。
From the word’s history
Wiktionary gives the word as clip + board. The name simply describes the object: a board with a clip.
Wiktionary 說這個字就是 clip（夾子）＋ board（板子）。名字等於把東西的長相講完了，所以第一個意思幾乎不用解釋；第二個意思則是把這個名字借去用在看不見的地方。
Wiktionary, "clipboard"
登入就可以看每一支怎麼連回核心畫面。