Tupperware is a brand of plastic food containers with lids that seal very tightly, so what is inside stays fresh and does not leak in your bag. But the useful thing for a learner is what has happened to the word: people say it for any container of that kind, whatever brand it really is.

Tupperware is a brand of plastic food containers with lids that seal very tightlyTupperware 是一個塑膠食物保鮮盒的品牌，蓋子密封得很緊, so what is inside stays fresh and does not leak in your bag所以裡面的東西能保持新鮮，放在包包裡也不會漏出來。 But the useful thing for a learner is what has happened to the word但對學英文的人來說，重點是這個字後來發生的變化: people say it for any container of that kind大家會用它來指任何這一類的保鮮盒, whatever brand it really is不管實際上是哪個牌子。

'Put the leftovers in a Tupperware', 'bring your own Tupperware' — nobody checks the label. That is called a brand name becoming the general word, the same thing that happened with Post-it or Xerox.

'Put the leftovers in a Tupperware'「Put the leftovers in a Tupperware」（把剩菜放進保鮮盒）, 'bring your own Tupperware'「bring your own Tupperware」（自己帶保鮮盒來）— nobody checks the label沒有人會去看標籤是哪個牌子。 That is called a brand name becoming the general word這叫做「品牌名稱變成通稱」, the same thing that happened with Post-it or Xerox跟 Post-it（便利貼）或 Xerox（影印）發生的事一樣。

Because of that history, you see it both ways. Strictly it is a brand, so capital T and no plural, like a material: 'a piece of Tupperware', 'a Tupperware box', 'all my Tupperware'. In everyday speech people happily say 'a Tupperware' and 'two Tupperwares' and write it with a small t. Neither will make you sound wrong; the capital-T, no-plural version is safer in writing.

Because of that history, you see it both ways因為有這段歷史，你會看到兩種寫法都存在。 Strictly it is a brand, so capital T and no plural, like a material嚴格來說它是品牌，所以要大寫 T，也沒有複數，用法像不可數的材料: 'a piece of Tupperware'像「a piece of Tupperware」（一件保鮮盒）, 'a Tupperware box'、「a Tupperware box」, 'all my Tupperware'、「all my Tupperware」（我所有的保鮮盒）。 In everyday speech people happily say 'a Tupperware' and 'two Tupperwares'但日常口語裡大家很自然地說「a Tupperware」和「two Tupperwares」 and write it with a small t也會寫成小寫的 t。 Neither will make you sound wrong兩種講法都不會顯得你錯; the capital-T, no-plural version is safer in writing但寫作時大寫 T、不加複數的版本比較保險。

One more piece of the picture: for decades the company sold at home parties, where a host invited friends over and someone demonstrated the containers — 'a Tupperware party' is a phrase you may meet in films.

One more piece of the picture還有一個背景值得知道: for decades the company sold at home parties這家公司有好幾十年是靠居家派對來賣東西的, where a host invited friends over and someone demonstrated the containers主人邀請朋友來家裡，有人會現場示範這些保鮮盒 — 'a Tupperware party' is a phrase you may meet in films「a Tupperware party」這個說法你可能會在電影裡看到。