一、经典哲理类

1. If you confer a benefit, never remember it； if you receive one, remember it always.

2. The heart has to hold, so Yiriweinian.

3. Emancipate yourself from the past. The only way to move forward is to stop looking back!

二、情感共鸣类

1. I don't know the taste of separation is so bleak, I do not know to say goodbye to so strong.

2. The more I do, the more I feel uncomfortable.

3. The pain of parting is unbearable, yet we must embrace the goodbye.

三、诗意表达类

1. Sunset sent you on a journey, and send you away, leaving the night sky cloudormer may also meet again

2. You are like a kite, either let me free or take you home, don't tie me with invisible strings

3. The most beautiful day is not rainy, for it's with you we can avoid the storm

四、简洁实用类

1. Take care, my friend.

2. See you soon!

3. I've got to go now.

五、特殊场景类

1. Good-bye! Though it's sad to speak the word, to destiny I bend

2. I won't hurt you anymore.

3. I don't want to part with you.

注：部分句子为中文翻译的英文表达，如"夕阳送你登程"可译为"Sunset sent you on a journey"，保留了原句的意境。建议根据具体场景选择表达方式，正式场合优先使用"Good-bye"、"See you soon"等经典用语，情感表达类则可搭配"I'll miss you"等补充说明。