Here are a few options for the description of a WordPress post tag “寄養制度” (Foster Care System) in Traditional Chinese, catering to different levels of detail and potential search intent:

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

> 有關寄養兒童、家庭，以及寄養制度相關資訊。提供深入探討、實用指南及最新發展。 (Information related to foster children, foster families, and the foster care system. Provides in-depth discussions, practical guides, and the latest developments.)

* **Why it’s good:** Directly states the subject matter and covers key related areas (children, families, system). Uses clear language.

**Option 2 (More Descriptive):**

> 詳細解說寄養制度的運作、流程、權益及挑戰。內容涵蓋成為寄養家庭的條件、寄養兒童的照護需求，以及政府與相關機構提供的支持服務。 (Detailed explanation of the operation, processes, rights, and challenges of the foster care system. Contents include the requirements to become a foster family, the care needs of foster children, and support services provided by the government and relevant organizations.)

* **Why it’s good:** More specific about the content covered. Highlights key issues and benefits of the tag (including rights, challenges, care needs). Good for informing readers and improving SEO.

**Option 3 (For a Blog with a Focus on Parenting/Welfare):**

> 關心兒童福利？ 這裡匯集了關於寄養制度的文章，幫助您了解如何支持弱勢兒童，以及寄養家庭所扮演的重要角色。 探索資源、分享經驗，並為孩子的未來盡一份心力。 (Concerned about child welfare? Here, we collect articles about the foster care system, helping you understand how to support vulnerable children and the important role foster families play. Explore resources, share experiences, and contribute to the children’s future.)

* **Why it’s good:** Appeals to a specific audience (parents, those interested in social welfare). Encourages engagement and action. Highlights the emotional aspect of the topic.

**Option 4 (Simple & SEO-Focused):**

> 寄養制度相關資訊，包括寄養兒童、成為寄養家庭、寄養流程等。 (Information related to the foster care system, including foster children, becoming a foster family, foster care procedures, and more.)

* **Why it’s good:** Uses key search terms directly and keeps it simple. Good for targeting specific keywords.

**To choose the best option, consider:**

* **Your blog’s overall theme and audience.**
* **The type of content you’ll be publishing under this tag.**
* **Your desired SEO goals.**

I would suggest adapting and combining elements from these options to create the most effective description for your WordPress post tag. For example, combine the directness of option 1 with the detail in option 2 for a good balance.