A bottle or container with a special double wall that keeps what is inside at its own temperature — hot drinks stay hot for hours, cold drinks stay cold. Workers carry one with tea or coffee; families take one on trips; students bring soup to school in the wide-mouthed kind.

A bottle or container一種瓶子或容器 with a special double wall有特殊的雙層壁 that keeps what is inside at its own temperature能讓裡面的東西維持原本的溫度 — hot drinks stay hot for hours熱飲可以保溫好幾個小時, cold drinks stay cold冷飲則保持冰涼。Workers carry one with tea or coffee工人會帶著裝茶或咖啡的保溫瓶; families take one on trips家庭出遊時會帶一個; students bring soup to school in the wide-mouthed kind學生則用寬口的那種帶湯到學校。

Strictly speaking, Thermos is a brand name, which is why you often see it with a capital T, and the general word is 'vacuum flask' (British) or just 'insulated bottle'. But the brand became so common that most people now use 'a thermos' with a small t for any bottle of this kind, the way people say 'a Band-Aid' for any sticky plaster.

Strictly speaking嚴格來說, Thermos is a brand nameThermos是個品牌名稱, which is why you often see it with a capital T這也是為什麼常看到它開頭大寫的T, and the general word is 'vacuum flask' (British) or just 'insulated bottle'而通用的說法是英式的'vacuum flask'或直接說'insulated bottle'。But不過 the brand became so common這個品牌太普及了 that most people now use 'a thermos' with a small t以至於現在大家用小寫的'a thermos'來 for any bottle of this kind泛指這一類的瓶子, the way people say 'a Band-Aid' for any sticky plaster就像大家用'a Band-Aid'泛指任何一種OK繃一樣。

Both spellings are normal; a careful writer capitalises it when talking about the actual company. In everyday speech people also say 'a flask' in Britain, and Americans often just say 'a thermos'.

Both spellings are normal兩種寫法都很常見; a careful writer capitalises it仔細一點的寫作者會大寫 when talking about the actual company在講到實際那家公司的時候。In everyday speech在日常口語裡 people also say 'a flask' in Britain英國人也會說'a flask', and Americans often just say 'a thermos'而美國人通常就直接說'a thermos'。