Okay, here are a few options for a WordPress post_tag description, playing with different nuances depending on your needs:

**Option 1: Simple and Direct**

* **Description:** LINE Pay 無法使用，包含原因和解決方案。
* **Translation:** LINE Pay cannot be used, including reasons and solutions.
* **Rationale:** This is a concise and clear description, directly addressing the problem. It’s suitable for tagging content that discusses LINE Pay issues.

**Option 2: More Detailed and Problem-focused**

* **Description:** 探討 LINE Pay 在台灣無法刷卡的原因、用戶遇到的問題，以及可能有效的解決方案。
* **Translation:** Explore the reasons why LINE Pay cannot be used in Taiwan, the problems users are facing, and possible effective solutions.
* **Rationale:** This is more descriptive, suitable if your content is in-depth and provides context. It explicitly mentions Taiwan, which can be useful for SEO if your target audience is there.

**Option 3: Focused on Troubleshooting**

* **Description:** LINE Pay 無法刷卡時的常見情況、故障排除指引、以及如何重啟交易。
* **Translation:** Common scenarios when LINE Pay cannot be used, troubleshooting guides, and how to restart transactions.
* **Rationale:** This description is best if your tagged articles focus on helping users solve issues. It targets users who are actively looking for help.

**Option 4: Keyword Rich (for SEO)**

* **Description:** LINE Pay 無法支付？刷卡失敗？付款錯誤？了解 LINE Pay 使用問題與解決方案，確保您的交易順利進行。
* **Translation:** LINE Pay cannot be paid? Card payment failure? Payment error? Understand LINE Pay usage issues and solutions to ensure your transactions go smoothly.
* **Rationale:** This option is intended for better SEO using similar search terms, which can help Google understand and index your content.

**How to choose the best description:**

* **Content of your tagged posts:** The description should accurately reflect the type of content you’re tagging.
* **Target audience:** Who are you trying to reach? Consider their level of technical knowledge and what problems they are likely facing.
* **SEO goals:** Do you want to rank higher in search engine results? Then, you may need to include relevant keywords in the description.

When you add the tag in WordPress, you will likely only need to add the *description* provided in one of the suggested options above. In addition, make sure you include a suitable *name* like `LINE Pay不能刷` or `LINE Pay 問題`.

Good luck!