Hermetic means closed so tightly that air cannot get in or out. A hermetic jar, box, or machine part keeps the inside separate from the room: no air, and often no water or dust either.

Hermetic means的意思是 closed so tightly關得很緊 that air cannot get in or out緊到空氣進不去也出不來。A hermetic jar, box, or machine part一個hermetic的罐子、盒子，或機器零件 keeps the inside separate from the room會讓裡面跟房間隔絕開來: no air沒有空氣, and often no water or dust either通常也沒有水或灰塵。

You will hear this most in science, factories, and on food or medicine packs. In real talk the set phrase is hermetically sealed.

You will hear this most你最常會聽到這個字 in science, factories, and on food or medicine packs在科學、工廠，還有食品或藥品包裝上。In real talk實際說話時 the set phrase is固定用法是 hermetically sealed hermetically sealed。

People also stretch it a little to mean “shut off from everyone outside”, like a small group that never explains itself. The tidy picture is a perfect seal.

People人們 also stretch it a little有時候也會把它延伸一點 to mean用來指 "shut off from everyone outside"「跟外面所有人隔絕」, like a small group that never explains itself像是一個從不對外解釋自己的小圈子。The tidy picture簡單來說，這個畫面 is就是 a perfect seal完美的密封。

The word does not come from hermit (a person who lives alone). It comes from an old story about Hermes Trismegistus, who could seal a treasure chest with magic. There is an older, bookish use too — “Hermetic” writings, secret wisdom — but on a packet in a shop it just means air cannot get through.

The word這個字 does not come from不是從...來的 hermit (a person who lives alone) hermit（隱士，獨居的人）。It comes from它來自 an old story一個古老的故事 about Hermes Trismegistus講的是Hermes Trismegistus（赫密士·崔斯墨吉斯托斯）, who could seal a treasure chest with magic他能用魔法封住一個藏寶箱。There is還有 an older, bookish use too一個比較舊、比較書面的用法 — "Hermetic" writings, secret wisdom像是「Hermetic」的著作、秘傳的智慧 — but on a packet in a shop但如果是寫在店裡的包裝上 it just means它就只是指 air cannot get through空氣穿不過去而已。