Here are a few options for the description of a WordPress post_tag “英文直書” (English vertical writing, in Traditional Chinese), ranging in tone and focus:

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

> 針對英文內容以直書（vertical writing）方式呈現的文章標籤。 探索英文直書的歷史、美學與實用性。

**(Translation: Tag for articles presenting English content in vertical writing. Explore the history, aesthetics, and practicality of English vertical writing.)**

**Why this is good:**
* Clear and to the point.
* Explains the function of the tag.
* Hints at the kind of content you might find.

**Option 2 (Emphasis on Learning & Exploration):**

> 探索英文直書的奇妙世界！本標籤收錄了關於如何在傳統直書格式中呈現英文的相關文章，包括排版技巧、文化背景和實用範例。 不論您是設計師、學生或只是對此感到好奇，歡迎一起深入了解英文直書的魅力！

**(Translation: Explore the fascinating world of English vertical writing! This tag gathers articles about how to present English in traditional vertical formats, including typesetting techniques, cultural context, and practical examples. Whether you’re a designer, student, or just curious, come explore the charm of English vertical writing!)**

**Why this is good:**
* Inviting tone.
* Appeals to a wider audience.
* Highlights the type of content available.

**Option 3 (Focus on Design & Practicality):**

> 專為設計師、排版師和對英文排版（vertical typography）有興趣的讀者設計。 本標籤包含英文直書版面設計、字體選擇、閱讀方向等相關資訊。了解如何在您的項目中有效地運用英文直書。

**(Translation: Designed for designers, typesetters, and readers interested in English typography (vertical typography). This tag contains information related to the design of English vertical layouts, font selection, reading direction, and more. Learn how to effectively use English vertical writing in your projects.)**

**Why this is good:**
* Targets a specific audience.
* Highlights practical applications.
* Suggests the type of information to be found.

**Option 4 (Simple & Direct):**

> 關於英文直書的相關文章。

**(Translation: Articles about English vertical writing.)**

**Why this is good:**
* Very concise.
* Good for general use if you want to avoid verbosity.

When choosing, consider:

* **Your audience:** Who are you writing for?
* **Your content:** What kind of information will you be tagging with this?
* **Your blog’s overall tone:** Do you want to be informative, friendly, or professional?

I recommend selecting the option that best aligns with your specific goals and content. Remember to use Traditional Chinese characters in the description to match the tag’s title. Good luck!