以下是一些友情名言的英文表達：
1. "A friend is a second self."
2. "A true friend is one who walks in when the rest of the world walks out."
3. "Friendship is like money, easy come, easy go."
4. "Friendship is the greatest thing in the world, but yet it is the most difficult thing to be sure of."
5. "A friend in need is a friend indeed."
6. "Friendship is not a matter of convenience, but of choice."
7. "Friendship is like flowers, it needs to be watered and nurtured to remain blooming."
8. "Without friends, life would be a world without sunshine and laughter."
9. "A true friend sticks by you, even in the darkest of times."
10. "A friend is a gift you give yourself."
希望這些名言能夠幫助您更好地理解友情的重要性。