Here are several descriptions for a WordPress post_tag with the title “撤銷” (Chu Xiao, meaning “Revoke” or “Cancel”) in Traditional Chinese, catering to different purposes:

**1. Short & Sweet (General Use):**

> 用於標記有關取消、撤銷、廢除或取消某事物的文章。
> (Used to tag articles about canceling, revoking, nullifying, or cancelling something.)

**2. Explanatory (Suitable for a blog offering legal or administrative information):**

> 標籤，用於分類探討撤銷、取消、廢除或使先前決定、行動或協議失效的討論、程序或法律觀點的文章。 涵蓋範圍包括：撤銷訂單、取消合同、撤銷權利或撤銷許可證等等。
> (Tag used to categorize articles discussing the revocation, cancellation, nullification, or the invalidation of previous decisions, actions, or agreements. Scope including: cancellation of orders, contract termination, revocation of rights, or license revocation, and the like.)

**3. Informative (For a blog on language, news, or society):**

> 這個標籤用於標記討論撤銷或取消事件、決定或行動的文章。 這可能包括但不限於： 撤銷協議、取消活動，又或法律上的撤銷行動。
> (This tag is used to mark articles discussing the revocation or cancellation of events, decisions, or actions. This may include, but is not limited to: revocation of agreements, cancellation of events, or legal revocation actions.)

**4. Action-Oriented (For a blog that facilitates user actions or transactions):**

> 標記與取消、撤銷或撤回相关的事物。 這可能包含了取消訂單、退款申請、或其它與撤銷相關的流程。
> (Tags the articles related to cancellation, revocation, or withdrawal. It can include order cancellation, refund application, or other processes related to revocation.)

**5. For a specifically technical blog (related to code or design):**

> 用於分類描述程式碼、設計或使用者介面中，撤銷/復原動作的文章。 包括例如: 撤銷操作、取消更改、或回復到之前的狀態。
> (Used to categorize the articles discussing revoke/undo actions in code, design or user interface. Includes operations like: revoke operations, cancel changes, or revert to the previous state.)

**Key Considerations When Choosing:**

* **Context:** Consider the overall theme and purpose of your blog or website.
* **Target Audience:** Speak to your readers in a language they understand.
* **Specificity:** The more specific the description, the better the tag will serve its purpose.

Choose the description that best suits your specific needs. You can always modify it slightly to make it even more perfect!