Seal plus -er gives you whatever does the . Picture something with a way in — the tiny holes in a concrete floor, the open top of a bag, an unstamped document, a game that is still winnable — and then picture the thing that closes it: a liquid, a machine, a person with a stamp, one late goal. English lets the -er point at a material, a tool or a human being without changing shape, which is why one small word covers so many different objects.
「sealer」可以想成 seal（封住）加上 -er（做那件事的東西或人）。先想像一個「還開著的口」——水泥地上的小孔、袋子沒封的開口、還沒蓋章的文件、還有機會翻盤的比賽。再想像那個把它關起來的東西：一罐塗料、一台機器、一個拿著印章的人、終場前的一球。英文的 -er 可以同時指材料、工具和人，形狀都不用改，所以這一個小字才能蓋住這麼多不一樣的東西。
From the word’s history
Formed from seal plus the ending -er, which names the thing or person that does the action.
由 seal 加上字尾 -er 組成，-er 指的是「做那個動作的東西或人」，所以字面上就是「封東西的那個」。
Wiktionary entry for sealer (etymology 1), etymology_text supplied in this packet: From seal + -er.
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