Here are a few options for the WordPress post_tag description, along with the rationale behind each. You can choose the one that best suits your specific needs and target audience.

**Option 1: Concise & Direct**

* **Title:** 孕婦飲食
* **Description:** 了解孕期飲食指南，提供健康飲食建議，保障準媽媽和寶寶的營養。

* **Rationale:** This is a simple, clear, and informative description. It directly states the topic and the benefit (healthy eating for mother and baby).

**Option 2: Explanatory & Keyword Focused**

* **Title:** 孕婦飲食
* **Description:** 專為孕婦設計的飲食資訊。 涵蓋孕期各階段的飲食重點、營養需求、推薦食譜、以及避免的食物。 幫助您輕鬆規劃健康的懷孕飲食，迎接健康的寶寶。

* **Rationale:** This description is a bit more detailed. It explains the content users can expect to find (different stages, nutrients, recipes, foods to avoid), aiming to attract users searching for specific information and good for SEO.

**Option 3: Focus on Practicality and Benefit**

* **Title:** 孕婦飲食
* **Description:** 懷孕期間不知道吃什麼？ 這裡提供實用的孕婦飲食建議，幫您擺脫飲食煩惱，補充必要營養，讓您擁有健康快樂的孕期生活！

* **Rationale:** This description asks a question to engage readers. It offers a promise (solving eating concerns) and promotes a positive outcome (a healthy and happy pregnancy). It includes a call to action to read the content within the tag.

**Option 4: Focus on broader advice.**

* **Title:** 孕婦飲食
* **Description:** 提供全面的孕婦飲食建議。包括懷孕各階段的營養需求、食材選擇、食譜分享，以及如何應對常見的飲食問題，為您的懷孕之旅提供營養支持。

* **Rationale:** Similar to Option 2, it adds “comprehensive”. It provides a overview about what information will be provided in the post, covering all key themes relevant to pregnancy diet.

**How to choose the best option:**

* **Consider your audience:** Are they looking for quick answers or in-depth information?
* **Think about SEO:** What keywords are people likely to search for?
* **What do you want to highlight?** The practical benefits, specific content, or general advice?

**To enter the description in WordPress:**

1. Go to “Posts” -> “Tags” in your WordPress dashboard.
2. Select the “孕婦飲食” tag (edit it).
3. In the “Description” field, enter your chosen description.
4. Click “Update Tag.”

I would recommend **Option 2 or 4** as they contain good amounts of keywords for SEO effectiveness, while providing the users an overview of all of the information, which is very useful.