Here are a few options for the description of the WordPress post tag “機械工程” (Mechanical Engineering) in Traditional Chinese, with varying tones and levels of detail:

**Option 1: Concise and Direct**

* **Description:** 涵蓋機械設計、製造、控制等領域的技術與應用。 (Covers the technology and applications in mechanical design, manufacturing, control, and other related fields.)

**Option 2: Slightly More Detailed**

* **Description:** 探索機械工程學的奧秘，包括材料力學、熱力學、流體力學等基礎知識，以及機械系統的設計、製造和維護。 (Explore the mysteries of mechanical engineering, including fundamental knowledge of materials mechanics, thermodynamics, fluid mechanics, and the design, manufacturing, and maintenance of mechanical systems.)

**Option 3: Focusing on Applications**

* **Description:** 分享機械工程在汽車、航空、機器人、能源等不同行業和領域的應用實例與最新發展。 (Share case studies and the latest developments in the application of mechanical engineering in various industries and fields such as automobiles, aviation, robotics, and energy.)

**Option 4: Keyword Rich (for SEO)**

* **Description:** 机械工程相關內容，包括機械設計、製造、工程材料、控制系統、自動化、機械人技術、熱力學、流體力學、引擎、設備維護。 (Mechanical Engineering related contents, including mechanical design, manufacturing, engineering materials, control systems, automation, robotics technology, thermodynamics, fluid mechanics, engines, and equipment maintenance.)

**Option 5: Casual & Welcoming**

* **Description:** 對機械工程充滿好奇？這裡分享關於機械設計、應用和最新技術的知識和動態，歡迎加入！ (Curious about mechanical engineering? Here we share knowledge and developments on mechanical design, applications, and the latest technologies, welcome to join us!)

**Which one is best?**

Choose the description that best suits your blog’s overall voice and the specific content you’ll be tagging. Consider:

* **Target Audience:** Are you writing for experts, students, or a general audience? Choose a description that matches their level of understanding.
* **Blog’s Focus:** What specific aspects of mechanical engineering will you be covering? The description should reflect this.
* **SEO:** If SEO is important, use a description that incorporates relevant keywords.

To add the description in WordPress, you can typically find the field in the “Tag” section when you’re editing a tag. Look for areas like “Description” or “Tag Description”. Good luck!