Here are a few options for the description of the WordPress post tag “已繳” (Already Paid) in Traditional Chinese, ranging in formality and conciseness:

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

* **Description:** 標示已完成付款的相關內容。 (Indicates content related to completed payments.)

**Option 2 (Slightly More Descriptive):**

* **Description:** 標記已繳費、已付款的狀態，方便查找相關資訊。 (Marks the status of being paid or having made payment, facilitating easy information retrieval.)

**Option 3 (Formal & Clear):**

* **Description:** 標示已完成付款、已結清款項的帖子，方便篩選和檢視相關內容。 (Indicates posts that have been paid for in full and finalized, making it easy to filter and view related content.)

**Option 4 (Informal & Practical):**

* **Description:** 看到這個就表示東西已經付錢啦！ 方便追蹤已付款的項目。 (Seeing this means the item is already paid! Convenient for tracking paid items.)

**Which one to choose depends on the context and your website’s style:**

* If your website is for a formal business, use Option 3.
* If you want a clear and concise description, use Option 1 or 2.
* If your website is more casual and playful, use Option 4.

I recommend going with **Option 2** for its balance of clarity and comprehensiveness. Remember to always include a description for your tags to improve SEO and user experience.