Here are a few options for the description of the WordPress post_tag “永居” in Traditional Chinese, varying in their length and focus:

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

> 關於永久居留、獲得身份的文章標籤。 [About articles tagged with Permanent Residency and obtaining Residency status.]

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

> 此標籤涵蓋與永久居留權、永久居留申請、以及在不同國家獲得身份相關的文章。 [This tag covers articles related to Permanent Residency, Permanent Residency applications, and obtaining Residency status in different countries.]

**Option 3 (Focus on Application and Process):**

> 關注永居申請流程、資格要求、以及相關法律法規的標籤。 [This tag focuses on the Permanent Residency application process, qualification requirements, and related laws and regulations.]

**Option 4 (More Conversational):**

> 想知道如何獲得永居身份？這個標籤收集了所有關於永久居留的文章，例如申請條件、所需文件等。 [Want to know how to obtain Permanent Residency status? This tag collects all articles about permanent residency, such as application requirements, required documents, and more.]

**Key elements considered when creating the description:**

* **Clarity:** The description should clearly explain what the tag is about.
* **Keywords:** It includes relevant keywords like “永久居留” (permanent residency), “身份” (identity/status), and “申請” (application).
* **Target Audience:** The description is written in a way that is easily understandable to a general audience.
* **SEO (Search Engine Optimization) Considerations:** While not overly focused, the keywords naturally help with search.

When choosing the best option, consider the content you’ll be associating with the tag. If you have a lot of in-depth content on the application process, Option 3 is suitable. If you have a broader range of topics, Option 2 or 4 might be better. Option 1 is a good, universal choice.