Express directly, tell experiences, quote famous quotes, describe feelings, and appeal for friendship.

1. Direct expression: For example, "I feel very disappointed and heartbroken. I found that some people will really stab me in the back."

2. Narrate the experience: For example, "Today I encountered A very chilling thing happened, which made me deeply experience the danger of people's hearts, but I will not give up my trust in friendship because of this."

3. Quotes: For example, "The person who stabs you in the back." As cold-blooded as a snake, it makes people feel chilling."

4. Describe feelings: For example, "I feel heartbroken because someone I trust stabbed me in the back."

5. Appeal to friendship: For example, "Although I have encountered such setbacks, I still believe in the power of friendship. Let us protect each other's trust and friendship together."