Picture something meeting a surface and not stopping at it. Cold air finds the gap in your coat; oil sinks into the wood instead of sitting on top. The word is not about being strong — it is about getting in. Once you hold that picture, the other uses are just different surfaces: the polite answer a question goes past, the wall of defenders a pass goes through, the body itself.
可以想成一個東西碰到表面，卻沒有停在那裡。冷空氣找到外套的縫就鑽進去；油不是浮在木頭上，而是吃進去。這個字的重點不是「力氣大」，是「進得去」。抓住這個畫面之後，其他用法只是換了要穿過的東西：問題穿過的是客套的說法，傳球穿過的是一排防守的人，另一個用法穿過的則是身體。
From the word’s history
From Latin penetrāre 'to penetrate', through Medieval Latin penetrativus and Middle English penetratyve — so the idea of going in has been in the word from the start.
字典把它一路追到拉丁文 penetrāre（進入、穿透），經過中世紀拉丁文 penetrativus 和中古英文 penetratyve 才進到現代英文。也就是說，「進得去」從一開始就是這個字的內容，不是後來才加上的。
Wiktionary, "penetrative"
登入就可以看每一支怎麼連回核心畫面。