one day 既可以用于过去时,也可以用于将来时。例如: I will take you there one day. 总有一天我会带你到那去的。 One day I met him in the street. 有一天我在街上遇见了他。 而some day则只能用于将来时。例如: Some day you will be sorry about it. 总有一天你会对这件事感到后悔的。 He put away those iron scraps, hoping that they may come in useful some day. 他把那些碎铁皮收藏起来,希望这些东西也许有一天会有用处。...