Here are a few options for the WordPress post_tag description, catering to different approaches:

**Option 1: Concise & Direct**

* **Description:** 了解如何建立與維護美好關係。

* **Translation:** Learn how to build and maintain good relationships.
* **Focus:** Straightforward and practical.

**Option 2: Focused on Understanding**

* **Description:** 探索「關係建立」的奧秘，包括溝通、信任與互相支持。

* **Translation:** Explore the mysteries of “relationship building,” including communication, trust, and mutual support.
* **Focus:** Emphasizes the depth and complexity of relationship building.

**Option 3: Benefit-Oriented**

* **Description:** 學習如何建立更強大的關係，提升生活品質、工作效率，以及幸福感。

* **Translation:** Learn how to build stronger relationships, improving your quality of life, work efficiency, and sense of happiness.
* **Focus:** Highlights the positive outcomes of strong relationships.

**Option 4: Suitable for a Website with Relationship-related Content**

* **Description:** 所有關於人際關係、溝通技巧、建立信任與愛情的文章分類。幫助您建立更健康、更幸福的關係。

* **Translation:** Categories all articles about interpersonal relationships, communication skills, building trust, and love. Helps you build healthier and happier relationships.
* **Focus:** Comprehensive and suitable for a website dedicated to relationships.

**Option 5: Shorter, more SEO-friendly**

* **Description:** 人際關係, 溝通, 建立信任.

* **Translation:** Interpersonal relationships, communication, build trust.
* **Focus:** Keywords, useful for internal linking and searches.

**Which One to Choose?**

Consider the following factors when selecting the best description:

* **The nature of your blog:** Is it a personal blog, a business blog, or something else?
* **Your target audience:** Who are you trying to reach?
* **The overall tone of your website:** Is it professional, friendly, educational, etc.?
* **SEO (Search Engine Optimization):** Do you want to include relevant keywords?

Choose the description that best reflects the content tagged with “關係建立” and the overall goals of your WordPress site. I would suggest something from **Option 1, 2, or 3** as they have good general applicability. If you want to focus on SEO, then make a version starting with **Option 5** and adding other relevant keywords.