Cell 是個名詞，且僅當名詞用，意為「細胞；電池；(監獄的) 小牢房；(修道院或寺廟的) 小房間；(蜂巢的) 巢室；(電腦) 儲存格；(政黨或政治團體的) 基層組織，小組」，如 Human brains have more than 100 million cells per cubic centimeter. (人腦每立方公分有一億多個細胞)；blood/brain/nerve/cancer cells (血球/腦細胞/神經細胞/癌細胞)；Samsung Electronics is recalling its flagship Galaxy Note 7 smartphone and said that battery cell problems were behind phones catching fire and exploding. (AFP) (三星電子將回收該公司的 Galaxy Note 7 旗艦機，並表示電池問題是手機起火和爆炸的主因)；The sinister and dangerous prisoner was locked in a cell. (那個兇惡危險的囚犯被關在單人牢房裡)。
根據《牛津英語大辭典》(The Oxford English Dictionary, OED)，cell 是英文最常用的 1,000 個單字之一。除了上述意思外，cell 在美國亦被用作 cellphone (手機) 的簡稱，常用於口語，如 I just bought a new cell yesterday, Samsung Galaxy Note 7, but it exploded during charging. (我昨天剛買了一支新手機，三星 Galaxy Note 7，但在充電時爆炸了)。
Sell 主要當動詞 (及物和不及物) 用，意為「賣，出售，銷售，推銷；說服，使接受；出賣」，如 Tom sold his old smartphone to me for 500 NT dollars . (湯姆以 500 元台幣的價錢把他的舊智慧型手機賣給我)；His new novel sold very well. (他的新小說賣得非常好)；In an interview, you have to sell yourself to the employer. (面試時，你必須對雇主推銷自己)；Television sells many products. (電視促銷了許多商品)；I could not sell my idea to all of you. (我無法使你們都接受我的想法)；I’m sure your idea will sell. (我相信你的觀點能被接受)。Sell 的時態變化為 sell sold sold selling sells。根據《牛津英語大辭典》，sell 也是英文最常用的 1,000 個單字之一。
Sell 亦可用作名詞，主要用於 hard sell 和 soft sell 這兩個片語中，前者意為「強迫推銷 (法)」，後者意為「軟性推銷 (法)」，如 The saleswoman gave me the hard sell yesterday. / The saleswoman did a hard sell on me yesterday. (那個女推銷員昨天對我強迫推銷)；Young salesmen found that soft sell works well with old housewives. (年輕的推銷員發現，不施加壓力的軟性推銷術對上了年紀的家庭主婦很管用)。