Here are a few options for a WordPress post tag description for “鎂元素” (Magnesium) in Traditional Chinese, ranging from simple to slightly more informative:

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

* **Description:** 鎂，人體必需的重要礦物質。 (Magnesium, an essential mineral for the human body.)

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

* **Description:** 關於鎂元素的文章，探討鎂的功效、食物來源以及如何維持身體健康。 (Articles about magnesium, exploring its benefits, food sources, and how to maintain good health.)

**Option 3 (More Emphasis on Benefits):**

* **Description:** 鎂元素，有助於肌肉舒緩、骨骼健康、穩定血糖和改善睡眠。 了解鎂對您身體的重要性！ (Magnesium, beneficial for muscle relaxation, bone health, stable blood sugar, and improved sleep. Learn about the importance of magnesium for your body!)

**Option 4 (SEO-Friendly):**

* **Description:** (針對SEO優化) 關於鎂元素 (鎂) 的最新資訊，包括鎂的功效、食物來源，以及如何預防鎂缺乏症，及健康生活與飲食。 (The latest information on magnesium (Magnesium), including its benefits, food sources, and how to prevent magnesium deficiency, for health and diet.)

**Considerations when choosing the best option:**

* **Your Audience:** Who are you writing for? Tailor the description to their level of knowledge.
* **Goal of the Post Tag:** What information do you want to convey? Are you just identifying the topic, or are you trying to draw people in?
* **SEO:** If SEO is important, include keywords like “鎂”, “镁” (Simplified Chinese, if targeting that audience as well), “功效” (effects), “食物來源” (food sources), “健康” (health). Option 4 is designed with SEO in mind.
* **Length:** Keep it relatively short, as tag descriptions are usually displayed in a small space.

**How to enter the description in WordPress:**

1. Go to **Posts > Categories** or **Posts > Tags** in your WordPress dashboard. (Depending on if you’re using categories or tags)
2. Click on the “Edit” link next to the “鎂元素” tag.
3. Find the “Description” field (some themes might put this in advanced settings).
4. Enter the description of your choice.
5. Click the “Update” button.

When setting up, ensure you use a WordPress plugin like Yoast SEO or Rank Math to optimize the tag page.
Choose the option that best suits your needs and the overall tone of your website. 選擇最能配合您的需要和網站整体風格的。