Here are a few options for a WordPress post tag description with the title “歷史價格” (Historical Prices) in Traditional Chinese, depending on the intended focus:

**Option 1: General & Concise**

* **Description:** 追蹤商品的過往價格，瞭解價格走勢。 (Track the past prices of products to understand price trends.)
* **Explanation:** Simple and direct, suitable for a wide range of content.

**Option 2: For E-commerce/Shopping**

* **Description:** 查閱商品在不同時間的售價，幫助您掌握最佳購物時機。 (Review the prices of products at different times to help you determine the best time to buy.)
* **Explanation:** Specifically geared towards users looking for historical price information for shopping decisions.

**Option 3: For Financial/Investment Content**

* **Description:** 分析股票、貨幣或其他資產的歷史價格數據，輔助您的投資決策。 (Analyze historical price data of stocks, currencies, or other assets to assist your investment decisions.)
* **Explanation:** Focuses on financial applications.

**Option 4: More Detailed**

* **Description:** 彙整並呈現商品的歷史價格，包含價格波動、最低價、最高價等資訊，讓您全面瞭解。 (Compile and present the historical prices of products, including price fluctuations, lowest price, highest price, and other information, providing you with a comprehensive understanding.)
* **Explanation:** A more informative description, suggesting the tag will include detailed price information.

**How to set the description in WordPress:**

When you are creating or editing the tag “歷史價格” in your WordPress Admin area:

1. **Navigate to Posts > Tags** (or the equivalent in your specific theme’s interface)
2. Locate the tag “歷史價格.”
3. In the “Description” field (or a similar field depending on your theme/plugins), enter the chosen description from above.
4. Save or Update the tag.

When selecting, consider:

* **Target Audience:** Who are you writing for?
* **Content Type:** What kind of content will this tag be used for?
* **Keywords:** Does the description contain clear keywords?

The best choice will depend on *your* blog and your audience.