如何写出好的 Prompt：实用指南（2026）

--- BAD ---
Write about AI.

--- GOOD ---
Role: You are a technology journalist writing for a general audience.
Task: Write a 300-word article explaining how AI chatbots work, using a simple analogy.
Context: The readers have no technical background. Avoid jargon. Use a restaurant analogy to explain how language models predict the next word.

--- BAD ---
Fix my code.

--- GOOD ---
Role: You are a Python debugging expert.
Task: Find and fix the bug in this function, then explain what was wrong.
Context: This function should return the factorial of n, but it returns incorrect results for n > 5.

```python
def factorial(n):
    result = 1
    for i in range(1, n):
        result *= i
    return result
```

--- BAD ---
Translate this.

--- GOOD ---
Role: You are a professional translator specializing in tech documentation.
Task: Translate the following English text to Chinese, keeping technical terms in English where appropriate.
Context: This is for a developer-facing API documentation page. The tone should be professional and concise.

Text: "The API key must be included in the Authorization header as a Bearer token."

三组坏 vs 好 Prompt 对比，展示添加角色、任务和上下文如何改善结果

--- FEW-SHOT EXAMPLE ---
Classify the sentiment of each review:

Review: "This product is amazing!" → Sentiment: Positive
Review: "Worst purchase ever." → Sentiment: Negative
Review: "It's okay, nothing special." → Sentiment: Neutral

Review: "Battery life is terrible but the screen is great." → Sentiment:

--- CHAIN-OF-THOUGHT EXAMPLE ---
Question: A store sells apples at $2 each. If you buy 5, you get 10% off your total. How much does buying 5 apples cost?

Let's think step by step:
1. Regular price for 5 apples: 5 × $2 = $10
2. Discount: 10% of $10 = $1
3. Final price: $10 - $1 = $9

Answer: $9

少样本提示和思维链推理的示例