Here’s a description for a WordPress post tag titled “秘密” in Traditional Chinese, keeping in mind SEO and potential usage:

**Short & Sweet (for immediate brevity):**

> 深入探索「秘密」的奧秘。 Discover the mystery hidden within “Secrets.”

**More Descriptive (for greater context):**

> **秘密 (Mì mì) – 探索隱藏的故事與訊息.**
>
> 這個標籤囊括了各種「秘密」相关的主题，包括：謎團、內幕、陰謀論、个人私密、以及鲜为人知的故事。 深入挖掘被遗忘的知识、个人回忆、以及隐藏在表象之下的真相。 欢迎分享和探索，一起揭开「秘密」的面纱.
>
> *Includes topics on mysteries, behind-the-scenes insights, conspiracy theories, personal confidences, and untold stories. Explore forgotten knowledge, personal memories, and the truths that lie beneath the surface. Welcome to share and explore, and together we uncover the veil of “Secrets.”*

**Considerations & Explanations:**

* **”Mì mì” (秘密):** Provides the Pinyin romanization for ease of understanding for English readers.
* **”探索隐 hidden 秘密” (探索隐藏的秘密):** Uses common verbs like “探索” (to explore, discover), making the meaning clear.
* **”謎團、內幕、陰謀論、个人私密、以及鲜为人知的故事”:** Includes examples of topics related to “秘密”, to encourage broader usage of the tag.
* **SEO:** The description uses relevant keywords that people might search for (e.g., “內幕” (insider information), “謎團” (mystery)).
* **Call to Action:** Encourages readers with a positive “欢迎分享” (welcome to share).
* **Context:** The description is flexible. You can modify it to match the specific content of your blog. If the primary focus is on historical secrets, you might adapt the language; if it’s about personal secrets, you might change the phrasing.
* **English Translation:** You could add an English translation to also help people who don’t know Chinese find the content.
* **Emphasis on “秘密” (Secrets):** The description consistently refers back to the central tag.
* **Grammar and Clarity:** The description is written in grammatically correct and easily understood Chinese.

**When you implement this in WordPress:**

1. **Go to Posts > Tags.**
2. **Find the tag “秘密” (or create a new one).**
3. **Add the description to the “Description” field.**

This description should effectively convey the meaning of the tag and make it more appealing to use. Remember to tailor it further to fit your specific blog’s content. Good luck!