Okay, here’s a suggested description for a WordPress post tag with the title “中文表達” written in Traditional Chinese, aiming for clarity and helpfulness:

**Description:**

> 用來標記與中文表達、語言運用、中文寫作、口語表達相關的文章。涵蓋範圍廣泛，包括如何更好地用中文溝通、詞彙選擇、語法使用，以及如何寫出更流暢、更清晰的中文文章。無論是想提高寫作文筆，還是改善口語表達技巧，標記此標籤的文章都能提供您需要的資訊。
>
> *(Used to tag articles related to Chinese expression, language use, Chinese writing, and oral expression. Covering a wide range of topics, including how to communicate in Chinese more effectively, vocabulary selection, grammar usage, and how to write more fluent and clearer Chinese articles. Whether you want to improve your writing skills or your oral expression techniques, the articles tagged with this tag can provide the information you need.)*

**Explanation of Choices & Why This Works:**

* **Concise & Relevant:** The description immediately states the purpose of the tag.
* **Broad Coverage:** It specifies a wide range of related topics.
* **Benefit-Oriented:** It highlights the benefits the user receives from articles with this tag (improve writing/speaking).
* **Clear & Understandable:** The language is straightforward and easy to understand, even for those who might not be experts in language or writing.
* **Target Audience:** It anticipates the needs of someone interested in improving their Chinese skills.
* **Translates Easily (Optional, in bracket) :** I have Included a translation in English, although it is likely not necessary.

**How to apply this in WordPress:**

1. **Go to your WordPress dashboard.**
2. **Navigate to “Posts” > “Tags”.**
3. **Find the “中文表達” tag.**
4. **Edit the tag.**
5. **In the “Description” field, paste the text above.**
6. **Save the changes.**

This description is designed to be helpful to readers and will help them understand exactly what kind of content is associated with the tag.