Here are a few options for a WordPress post_tag description in Traditional Chinese for the title “線上KYC”, with varying levels of detail and emphasis:

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

> 線上客戶盡職調查 (KYC)，了解客戶的流程與方法。

* **Translation:** Online Know Your Customer (KYC), understanding the processes and methods for customers.
* **Good for:** General use, easy to understand, highlights the core concept.

**Option 2 (Slightly More Descriptive):**

> 關於線上KYC (客戶盡職調查)的資訊，包括如何進行、相關法規、以及常見問題。

* **Translation:** Information about online KYC (Know Your Customer), including how to implement it, relevant regulations, and frequently asked questions.
* **Good for:** Providing context and indicating the type of content related to this tag.

**Option 3 (Emphasizing Security & Verification):**

> 線上KYC，安全可靠的客戶身份驗證與風險評估。

* **Translation:** Online KYC, secure and reliable customer identity verification and risk assessment.
* **Good for:** Emphasizing the security aspects that are crucial in KYC.

**Option 4 (Specific to Target Audience):**

> 針對金融機構、交易所等機構提供的線上KYC解決方案，提高合規性，降低風險。

* **Translation:** Online KYC solutions for financial institutions, exchanges, and other organizations, to improve compliance and reduce risk.
* **Good for:** If the posts are primarily targeted to specific industry related posts.

**How to use these descriptions in WordPress:**

1. **Go to your WordPress admin panel.**
2. **Navigate to “Posts” > “Tags” (or “Categories” if you are using a Category for the tag).**
3. **Find the tag named “線上KYC”.** If you haven’t created it yet create a new one for “線上KYC”.
4. **Edit the Tag.**
5. **In the “Description” field, paste one of the descriptions above.**
6. **Click “Update Tag” (or “Add New Tag”).**

Choose the description option that best reflects the content and focus of your posts tagged with “線上KYC”. Make sure it’s clear, informative, and relevant to your target audience.