裝重要公文的那個上鎖箱子
這一族就是核心畫面本身：一個可以提著走、鎖得住的公文箱。
noun · C1
A strong box with a lock, used for carrying and keeping official papers. It is countable, so a government office can own many of them.
公文箱
核心畫面
Picture a leather box with a lock on it, holding papers that matter. A dispatch is an important official message, so this is the box such messages travel in — you can carry it, and nobody can open it on the way. Everything the word does starts from that box: first the thing itself, and then the famous one that stopped travelling and stayed on a table in Parliament.
可以想成一個上了鎖的皮箱，裡面裝著很要緊的文件。dispatch 指政府或軍方的重要公文，所以這就是裝那些公文的箱子…更多收起
可以想成一個上了鎖的皮箱，裡面裝著很要緊的文件。dispatch 指政府或軍方的重要公文，所以這就是裝那些公文的箱子：提得走，路上沒人打得開。這個字的兩個意思都從這個箱子出發，先是箱子本身，再來是那個不再被提來提去、留在國會桌上的著名版本。From the word’s history
Wiktionary gives the word as dispatch ('important official message sent by a diplomat, government official or military officer') plus box, and records that the Parliament sense comes from ministers formerly using their document boxes as lecterns; purpose-made wooden boxes later replaced them.
Wiktionary 記載這個字是 dispatch（外交官、政府官員或軍官送出的重要公文）加上 box。國會那個意思的由來是：以前部長把自己的公文箱帶進議場，發言時直接當講台用；後來改成專門做的木盒，名字卻留了下來。
Wiktionary (kaikki dump, source_ref kaikki:3f6f69a190036ae4:2565642858:9476), supplied in the evidence packet
Two branches
留在國會桌上的那一個
同一個箱子，只是不再被提著走。它留在議事廳中央的長桌上，從盛公文的容器變成發言時靠著的位置。
noun · C1
In the British Parliament, the box that stands on the table in the middle of the room. Senior members stand beside it to make their speeches, so 'at the dispatch box' means speaking in that formal place.
（英國國會）發言台木盒