Here are a few options for descriptions, ranging in formality and detail, for a WordPress post tag titled “燃料稅計算” (Fuel Tax Calculation) in Traditional Chinese:

**Option 1: Concise & General**

> 涵蓋與燃料稅計算相關的所有內容。

> *Translation: Covers all content related to fuel tax calculation.*

**Option 2: Slightly More Detailed**

> 關於汽車、機車及其他車輛燃料稅計算的各種資訊，包括稅率、計算方法及相關政策。

> *Translation: Various information on fuel tax calculation for cars, motorcycles, and other vehicles, including tax rates, calculation methods, and related policies.*

**Option 3: Aimed at a Specific Audience (e.g., Vehicle Owners)**

> 了解您的車輛燃料稅是如何計算的。這裡提供最新的稅率更新、計算公式以及如何輕鬆預估您的燃料稅費用。

> *Translation: Understand how your vehicle’s fuel tax is calculated. This provides the latest tax rate updates, calculation formulas, and how to easily estimate your fuel tax costs.*

**Option 4: Focus on Practical Application**

> 幫助您掌握燃料稅計算技巧，包括適用於不同車輛類型的稅率、申報流程，以及如何避免潛在的罰款。

> *Translation: Help you master fuel tax calculation skills, including tax rates applicable to different vehicle types, declaration procedures, and how to avoid potential penalties.*

**Option 5: Simple & SEO-Friendly**

> 燃料稅計算、車輛稅、稅務資訊、計算方法。

> *Translation: Fuel tax calculation, vehicle tax, tax information, calculation methods.* (This is good for incorporating relevant keywords)

**Which option should you choose?**

* **Consider your target audience:** Are you writing for the general public, vehicle owners, or tax professionals?
* **Think about the content of your posts:** Does your content focus on basics, in-depth calculations, or government policies?
* **Keep it concise:** WordPress tag descriptions should be clear and to the point.
* **SEO (Search Engine Optimization):** Include relevant keywords to help people find your content. The final option is very good for SEO.

Choose the description that best reflects the content you’ll be tagging and the audience you want to reach. You can always edit the description later if needed.