Loss是名詞,其意是:損失,遺失等
如:Einstein's death means a great loss to science.(愛因斯坦的死對科學是重大的損失)
而Lose是動詞,其意是:失去
如:You will lose all your money, if you indulge yourself in gambling.
而Lost可以是lose的過去式或過去分詞,但它也是一個形容詞,其意是:遺失的,迷途的,如:
The lost ring was found yesterday. (昨天找到了那遺失的戒指)
The lost child is crying. (那迷途的小孩正在大哭)