讓空氣流通
這一組就是核心畫面本身：空氣有進有出。差別只在於，一個是你現在做的動作，一個是做進物品裡的結構。
verb · B2
To let fresh air move into and through a room, building, or other closed space, so that the old, stale air is pushed out.
通風
核心畫面
Air that is shut in goes stale. Make an opening, and fresh air comes in while the old air goes out. That one movement — shut in, then let through — sits under everything this word does: a room with the windows open, a pair of lungs with a machine attached, a box with holes cut in its sides, and even a feeling somebody has been holding on to.
悶住的空氣會變濁。開一個口，新鮮空氣就進來，舊的出去。這個「本來悶著，然後讓它流通」的動作，可以想成是 ventil…更多收起
悶住的空氣會變濁。開一個口，新鮮空氣就進來，舊的出去。這個「本來悶著，然後讓它流通」的動作，可以想成是 ventilate 每個用法底下共通的那條線。房間是這樣：打開窗。肺是這樣：機器把空氣送進送出。箱子是這樣：側邊打洞讓空氣過。連壓在心裡的情緒，英文也用同一個動作來講。From the word’s history
Wiktionary gives the route only as far as Latin: English borrowed ventilātus, the past participle of the verb ventilō, by way of Middle English. The packet does not gloss the Latin verb itself, so nothing further is claimed here.
資料只交代到拉丁文這一層：英文借的是動詞 ventilō 的過去分詞 ventilātus，中間經過中古英文。手上的資料沒有進一步說明那個拉丁動詞本身的字面意思，所以這裡也不再往下推。
Wiktionary entry for ventilate, etymology_text, supplied in this batch packet as kaikki:3f6f69a190036ae4:861520044
Three branches
讓空氣進出肺
把房間換成人的肺：機器代替了窗戶，把空氣送進去、再放出來。動作的形狀完全一樣，只是尺寸和場合變了。
verb · C1
To push air into and out of a sick person's lungs using a machine, because they cannot breathe well enough on their own.
使用呼吸器輔助呼吸
讓心裡的東西透氣
把同一個動作搬到情緒上：悶著的心情被講出來，就像悶住的空氣被放出去。這是一種比喻的讀法，幫你記住這個用法，不是在說它比較晚才出現。
verb · C1
To say openly what you think or feel about something, instead of keeping it inside.
抒發（想法、情緒）