See you around! (刚见面说不定一会儿又见面)

VS

Farewell (=to fare you well)!(较正式, “再见”常含有“永别了或不容易再见面)

Goodbye！Thank you for your attention. (再见！谢谢诸位捧场。”这是演讲人结束演讲时的用语)

VS

Good luck to you! (祝你成功或顺利！是祝愿某人顺利完成某事或一路平安时的告别用语)

Good morning! (有时可以用作上午分别时的告别用语，这时两个词多重读)

VS

Good night! (晚安！一般是在晚上睡觉前分别时说的。如: Good night! Thanks again for coming. 晚安！再词谢谢光临。但美国人有时在下班时也互道一声“Good night.”表示今天不再见面了)

Bye-bye! (不太正式的告别用语。熟人之间常用)

VS

Bye-now! (重在强调时间的短暂)