Okay, here are a few options for a WordPress post_tag description for the tag “使用期限” (Using Period/Expiration Date) in Traditional Chinese, catering to different levels of detail and target audiences:

**Option 1: Concise & General**

* **Description:** 商品、服務或其他產品的有效日期或可用期限範圍。 (Describes the valid date or the usable period for goods, services, or other products.)
* **Keyword:** 截止日期, 保存期限, 有效期 (Expiration Date, Shelf Life, Validity Period)

**Option 2: More Detailed (For Technical Use or Detailed Articles):**

* **Description:** 標示產品、服務或資訊在特定時間範圍內有效或可用的時間點。這包括商品的保質期、使用期限，以及軟體、合約等其他形式的有效期。 (Indicates the timepoint when a product, service, or information is valid or usable within a specific time range. This includes the shelf life of goods, the period of use, as well as the validity of software, contracts, and other forms.)
* **Keywords:** 到期, 期限, 壽命, 使用時限, 保質期, 到期日 (Expire, Deadline, Lifetime, Usable Time Limit, Shelf Life, Expiration Date)

**Option 3: Focusing on User Guidance (Suitable for Informative Blogs/Websites):**

* **Description:** 了解商品、服務或資訊的有效時限，確保您在安全和品質最佳的狀況下使用。 (Learn about the validity period of goods, services, or information. Ensure that you are using them in the safest and best quality condition.)
* **Keywords:** 到期提醒, 使用方法, 檢查, 健康 (Expiration reminders, Usage Method, Check, Health)

**Option 4: If targeting a specific industry or product type, adjust accordingly. For example, for Food:**

* **Description:** 食品的保質期、最佳食用日期，以及食品安全相關的注意事項。 (The shelf life, best-by date, and important considerations regarding food safety.)
* **Keywords:** 食品, 保質期, 過期, 健康飲食 (Food, Shelf Life, Expired, Healthy Diet)

**Key Considerations when choosing:**

* **Target Audience:** Who are you trying to reach with your content?
* **Scope of content:** What topics will be covered in posts tagged with this tag?
* **Purpose of the Tag:** Is it purely for categorization, or are you using it to provide information / create user expectation?

**How to Use within WordPress:**

1. **Go to Posts > Tags** in your WordPress admin panel.
2. **Add New Tag** or **Edit** the existing tag “使用期限”.
3. **Name:** (Already filled: 使用期限)
4. **Slug:** (Typically WordPress will auto-generate this based on the name, but you can edit it – e.g., `shiyongqixian` or `expiration-date`. Keep it lowercase and use hyphens.)
5. **Description:** Paste one of the descriptions above.
6. **Parent Tag:** (Leave Blank if it is a primary Tag)
7. **Click “Update” (if editing) or “Add New Tag”.**

By creating a clear and descriptive tag description, you’ll improve both the organization and SEO of your WordPress site, making it easier for users (and search engines) to understand the content related to the “使用期限” / “Expiration Date”.