真的拉鍊
核心畫面原封不動：手上真的有一條拉鍊被拉開。差別只在句子裡誰當主詞。
verb · A2
To open a bag, coat, tent, or anything else that has a zip, by pulling the zip along so that the two sides come apart.
拉開拉鍊
核心畫面
Two rows of teeth locked tightly together, and a hand pulling the little slider along so they come apart and the thing falls open. Whatever was shut and held closed is now open again.
可以想成兩排咬得緊緊的齒，被一個小拉頭一路拉過去，就一排排鬆開，東西整個敞開。本來是「扣住、收緊」的狀態，現在被倒回…更多收起
可以想成兩排咬得緊緊的齒，被一個小拉頭一路拉過去，就一排排鬆開，東西整個敞開。本來是「扣住、收緊」的狀態，現在被倒回去了。這個「把扣在一起的東西拉開」的畫面，就是 unzip 從外套到電腦檔案共用的那條線。From the word’s history
Wiktionary gives the word as un- + zip. The prefix un- on a verb means undoing the action, as in tie/untie and lock/unlock, so unzip is simply zip run backwards.
來源就是 un- 加 zip。un- 放在動詞前面表示把動作倒回去，像 tie／untie、lock／unlock。所以 unzip 字面上就是「把 zip 這個動作倒著做一次」。
Wiktionary entry 'unzip' (kaikki extract, source_ref kaikki:3f6f69a190036ae4:1394183008): "From un- + zip."
Two branches
螢幕上的拉鍊
電腦把「收緊成一包」這件事叫 zip，於是把它拆開還原就順理成章叫 unzip。畫面沒變，只是那條拉鍊變成看不見的。
verb · B1
To open a computer file or folder that has been packed into a zip file, so that it goes back to its normal size and you can use the files inside.
解壓縮