Okay, here’s a WordPress post_tag description for the title “誰是” (Shéi shì) in Traditional Chinese, keeping it concise and relevant:

**Description:**

標記與「誰是」相關的內容。用於識別涉及「誰是」（Who is? / Who are?）的問題、討論、人物等等，包含身份、歸屬以及相關資訊。
**(Translation in English: Tag related to “Who is?”. Used to identify content related to “Who is?” questions, discussions, people, etc., including identity, affiliation, and related information.)**

**Why this description works:**

* **Clear and Concise:** It directly states the purpose of the tag: to categorize content related to “誰是”.
* **Contextual:** It explains what the tag encompasses: anything regarding “Who is?”.
* **Specific:** It provides examples of what kind of content *would* be tagged, giving the user a better understanding.
* **Includes English Translation:** The inclusion of the English equivalent helps users who might be less fluent in Traditional Chinese and makes searching across multiple languages easier.
* **Good Keyword Placement:** It uses terms that a user searching in either Chinese or English would likely type.

This description is suitable for use in the “Description” field within WordPress’s post_tag management. It’s important to have descriptions as they are critical for helping the users/editors understand the purpose of the tag.