真的那一條線
這一支是畫面本身：紙上、螢幕上真的存在的那條線，以及被單獨留在鍵盤上的那個符號。
verb · B2
To draw or print a line under a word or phrase, usually to show that it matters.
在…下面劃線
核心畫面
A line that runs along the bottom of something. It never gets in the way of the words above it — it just sits underneath and holds them up, and because it sits there, your eye goes to whatever is resting on it. Draw it under a word and the word matters more; leave it alone on a keyboard and it becomes a character you can type; put music in that same low position and it carries a scene without being noticed.
可以想成一條走在底下的線。它從來不擋住上面的字，只是墊在下面把它們托住；也正因為它在那裡，眼睛就會落在停在它上面的東…更多收起
可以想成一條走在底下的線。它從來不擋住上面的字，只是墊在下面把它們托住；也正因為它在那裡，眼睛就會落在停在它上面的東西。劃在一個字底下，那個字就變得重要；單獨留在鍵盤上，它就成了可以打出來的符號；把音樂放在同樣的低位，它就能撐住一場戲而不被注意。From the word’s history
The packet gives the compound only: under- + score. Score names a scratched or drawn mark, so the word reads as a mark made underneath.
本包裹的字源只說它由 under- 加 score 組成。score 指的是劃出來或刻出來的痕跡，所以整個字讀起來就是「在下面劃的一道痕」。
Wiktionary entries ‘underscore’ (noun source_ref kaikki:3f6f69a190036ae4:916556863:15281; verb source_ref kaikki:3f6f69a190036ae4:916572144:10758): etymology_text ‘From under- + score.’
Two branches
把線劃在意思底下
同一條線從紙面移到想法底下：被劃到的不再是某個字，而是某個重點。
verb · B2
To make it clear that something is important or true, by saying it, showing it, or being the thing that proves it, in a way people cannot miss.
凸顯／強調