友谊是人生中最珍贵的财富之一，它不仅让我们感受到温暖和关爱，还能让我们在困难时刻得到支持和帮助。因此，我们应该珍惜每一个朋友，不忘友谊，让它成为我们一生中最美好的回忆。

Here are some phrases in English to express the importance of not forgetting friendship:

1. A true friend is someone who knows all about you and still loves you.

2. Friendship is the only cement that will ever hold the world together.

3. Without friends, no one would want to live, even if he had all other goods.

4. A friend is one of the nicest things you can have, and one of the best things you can be.

5. Friendship is the golden thread that ties the heart of all the world.

6. True friends are never apart, maybe in distance but never in heart.

7. The greatest gift of life is friendship, and I have received it.

8. A single rose can be my garden... a single friend, my world.

9. The only way to have a friend is to be one.

10. Friends are the family we choose for ourselves.

Let us cherish our friendships and never forget the importance of having good friends in our lives.