Here are a few description options for the WordPress post tag “頸椎” (Cervical Spine) in Traditional Chinese, ranging in formality and specificity:

**Option 1: Concise & General (Recommended for most use cases)**

* **Description:** 控制頭部和頸部活動的脊椎部分。 (The part of the spine that controls head and neck movement.)

**Option 2: Slightly More Detailed**

* **Description:** 頸椎是指構成頸部脊椎骨，負責支撐頭部、保護脊髓，並協助頸部靈活活動的生理結構。 (The cervical spine refers to the vertebrae that make up the neck, responsible for supporting the head, protecting the spinal cord, and assisting in the flexible movement of the neck.)

**Option 3: Focused on Health (If the blog covers health topics)**

* **Description:** 瞭解頸椎的結構、功能以及常見疾病與保健方法。 (Learn about the structure, function, and common diseases and preventive measures related to the cervical spine.)

**Option 4: Extremely Concise (For very limited space)**

* **Description:** 頸部脊椎。 (Cervical spine: Neck spinal column)

**How to choose the best description:**

* **Consider your target audience:** Are they general readers, or are they medically inclined?
* **Think about your blog’s focus:** Does your blog delve into health topics, or is it more general?
* **Character count:** WordPress post tag descriptions can be limited, though the exact character limit depends on the theme and SEO plugins you have installed.

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

1. **In the WordPress Admin:**
2. **Posts > Tags** (or **Tags > Categories** depending on your setup)
3. **Find the “頸椎” tag and click it**
4. **Scroll down in the edit screen to the Description box and enter the description**
*(If you don’t see a Description box, make sure that “Tags” are enabled under the “Screen Options” menu at the top of the page.)*
5. **Click “Update” to save the tag.**

I recommend Option 1 or Option 2 for a good balance of information and brevity. Good luck!