Here are a few options for a WordPress post tag description for “線上閱讀” (Online Reading) in Traditional Chinese, ranging in specificity:

**Option 1: General and Concise**

* **Description:** 盡情享受線上書籍、文章、和文件，隨時隨地都能閱讀。 (Enjoy online books, articles, and documents, read them anytime, anywhere.)

**Option 2: Focused on Ease and Accessibility**

* **Description:** 快速找到線上閱讀資源，包括電子書、新聞報導、博客文章等，方便您輕鬆瀏覽與閱讀。 (Quickly find online reading resources, including e-books, news reports, blog posts, etc., making it easy for you to browse and read.)

**Option 3: Emphasizing Variety**

* **Description:** 發掘豐富的線上閱讀內容，涵蓋不同領域，從文學到科技，應有盡有。 (Discover a wealth of online reading content, covering different fields, from literature to technology, everything is available.)

**Option 4: More Specific (if your site has a reading list feature)**

* **Description:** 瀏覽與儲存您的線上閱讀清單，輕鬆收藏喜愛的文章，隨時回到閱讀進度。 (Browse and save your online reading list, easily bookmark your favorite articles, and always return to your reading progress.)

**Which one to choose?**

* Choose **Option 1 or 2** if you want a simple, general description.
* Choose **Option 3** if you want to highlight the variety available in the tagged items.
* Choose **Option 4** if the site features a way to save articles to a reading list.

**Important Notes for WordPress:**

* **Character Limit:** Consider the character limit in the WordPress tag description field. These options fit well within a reasonable limit.
* **SEO Optimization (Optional):** The description offers small SEO benefits, so feel free to add relevant keywords. The given suggestions have basic benefits.
* **Context:** The ideal description may be slightly better tailored depending on your audience and the type of content tagged with this tag. Consider the common content types on your site.