送出去這件事，和被送出去的東西
兩個意思共用同一條路線，只是站的位置不同：一個是動作，一個是結果。
noun · C1
The process by which a living body gets rid of the waste material it cannot use, for example as urine, sweat, or gas from the lungs.
排泄（過程）
核心畫面
Think of a body as something with an outward line running through it. Food and drink come in, the body takes what it can use, and what is left cannot simply stay — it has to be sent out. Kidneys handle one part of the line, skin another, lungs another. The word excretion sits on that line and can stand at either end of it: the sending-out itself, or the stuff that has been sent out.
可以想成身體裡有一條往外的輸出路線。吃進去、喝進去的東西，身體取走能用的部分，剩下的不能一直留著，得送出去。腎臟負責…更多收起
可以想成身體裡有一條往外的輸出路線。吃進去、喝進去的東西，身體取走能用的部分，剩下的不能一直留著，得送出去。腎臟負責一段，皮膚負責一段，肺再負責一段。excretion 這個字就站在這條路線上，而且可以站在兩端：講那個「送出去」的動作時，它是過程；講被送出去的那些東西時，它就是那些東西。英文用同一個字表示動作和結果，靠可不可數來分。From the word’s history
From Latin excerno, to sift out or separate out: ex- meaning out, plus a root about sifting. The body is pictured as sorting, keeping what it needs and letting the rest through.
來自拉丁文 excerno，意思是「篩出來、分開」。ex- 是「出去」，後半段跟「篩、分」有關。也就是說，這個字本來的畫面是身體在做分類：留下能用的，把其餘的篩出去。
Wiktionary kaikki extract, source_ref kaikki:3f6f69a190036ae4:1139813841:14407 (Middle French excrétion / Late Latin excretio, from Latin excerno)
One branch