Here are a few options for the post_tag description, catering to different levels of detail and SEO considerations, all in Traditional Chinese:

**Option 1 (Concise & General):**

> 關於線上銀行服務的標籤。探討網上銀行、手機銀行、網上理財等相關資訊。

* **Explanation:** This is a simple and effective description. It clearly states what the tag covers and uses keywords that are often searched.

**Option 2 (Keyword-Rich & Slightly Longer):**

> 標籤包含關於線上銀行、網上銀行、手機銀行、電子銀行等所有相關的文章。 涵蓋開戶、轉帳、理財、安全，以及各家銀行的線上服務比對。

* **Explanation:** This version includes more keywords (e.g., 開戶, 轉帳, 理財, 安全, 比對), explicitly covering potential user interests and expanding its searchability.

**Option 3 (Focus on User Benefit):**

> 在這裡，您可以找到有關線上銀行的一切信息，幫助您輕鬆管理財務、安全交易，並充分利用您的銀行服務。 包括各銀行的使用教學、最新優惠、比較評論等。

* **Explanation:** This description focuses on the benefits for the user, making it more appealing. It uses words like “輕鬆管理財務” and “安全交易” and promises valuable information.

**Option 4 (Short & Actionable):**

> 了解線上銀行！ 掌握開戶、轉帳等技巧，安全便捷管理您的資金。

* **Explanation:** A brief and to-the-point approach, emphasizing the practical benefits of using online banking.

**Choosing the Right Option:**

* Consider your target audience and the overall tone of your blog.
* Think about what keywords you want to rank for.
* Don’t make the description too long, as users may lose interest.
* **Important:** When adding these descriptions in WordPress, you’ll typically enter them in the “Description” field for the tag.

I recommend Option 2 or 3 as they provide a good balance of information and SEO optimization. Remember to edit the descriptions for accuracy and match the style of the rest of your site.