Here are a few options for the description of the WordPress post_tag “三大營養素” (Three Major Nutrients) in Traditional Chinese, each with a slightly different focus:

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

> 了解您身體所需的三大營養素：碳水化合物、蛋白質和（健康）脂肪。 探索它們的重要性、功能，以及如何從飲食中獲取它們。

> *Translation: Learn about the three major nutrients your body needs: carbohydrates, protein, and (healthy) fats. Explore their importance, functions, and how to obtain them from your diet.*

**Option 2 (Slightly more detail, focusing on balance):**

> 認識提供我們能量、建造和修復身體，以及維持整體健康的三大營養素：碳水化合物、蛋白質和脂肪。 保持均衡的飲食，確保您攝取足夠的這些重要營養素。

> *Translation: Get to know the three major nutrients that provide us with energy, build and repair our bodies, and maintain overall health: carbohydrates, protein, and fat. Maintain a balanced diet to ensure you are consuming enough of these essential nutrients.*

**Option 3 (Emphasizing healthy choices):**

> 探索三大營養素：碳水化合物、蛋白質和脂肪。了解如何選擇健康的碳水化合物、優質蛋白質，並攝取健康脂肪，以支持您的身體健康目標。

> *Translation: Explore the three major nutrients: carbohydrates, protein, and fat. Learn how to choose healthy carbohydrates, high-quality protein, and consume healthy fats to support your body’s health goals.*

**Option 4 (Focusing on potential benefits):**

> 三大營養素是構成我們飲食的基礎：碳水化合物、蛋白質和脂肪。在本標籤下，找到更多關於如何優化您的營養攝取，增進能量、提升肌肉修復，以及支持整體健康的資訊。

> *Translation: The three major nutrients are the foundation of our diet: carbohydrates, protein, and fat. Under this tag, find more information on how to optimize your nutrient intake to boost energy, enhance muscle repair, and support overall health.*

**Key Considerations when choosing:**

* **Target Audience:** Who are you writing for? Are they beginners or more advanced?
* **Overall Blog Style:** Does your blog prefer concise or more detailed descriptions?
* **Content Focus:** What type of articles typically fall under this tag? (e.g., healthy recipes, fitness tips, etc.)

Choose the description that best fits your audience and the content of your blog! Remember to also use the SEO settings in your WordPress plugin to further optimize it if needed.