Okay, here are a few options for a WordPress post_tag description for the title “自然殺手細胞” (Natural Killer Cells) in Traditional Chinese, ranging in formality and focus:

**Option 1: Concise and Informative**

* **Description:** 探討自然殺手細胞 (NK 細胞) 在免疫系統中的作用，尤其是它們在識別和摧毀癌細胞或受感染細胞方面的關鍵功能。
* **Translation:** This tag explores the role of Natural Killer cells (NK cells) within the immune system, particularly their key function in identifying and destroying cancer cells or infected cells.

**Option 2: Slightly More Detailed, Targeting Education**

* **Description:** 了解自然殺手細胞 (NK 細胞) 是如何成為身體抵抗疾病的第一道防線。我們深入探討它們的激活、作用機制，以及在免疫治療中的潛力。包含 NK 細胞與癌症、病毒感染等關聯資訊。
* **Translation:** Learn how Natural Killer cells (NK cells) act as the body’s first line of defense against disease. We delve into their activation, mechanisms of action, and potential in immunotherapy. Includes information on the connection between NK cells and diseases such as cancer and viral infections.

**Option 3: Focusing on General Health and Practicality**

* **Description:** 認識自然殺手細胞 (NK 細胞)，以及提升免疫系統活力的重要性。探索如何透過飲食、生活習慣等方式，支持 NK 細胞的健康功能，增強抵抗力。
* **Translation:** Understand Natural Killer cells (NK cells) and the importance of boosting immune system vitality. Explore how to support the healthy function of NK cells and enhance resistance through diet, lifestyle habits, and other strategies.

**Option 4: Formal and Technical (For a Science-Focused Blog)**

* **Description:** 涵蓋自然殺手細胞 (NK 細胞) 的細胞生物學、免疫學特性，以及它們在腫瘤免疫學、抗病毒免疫中的作用。本標籤下文章包含細胞識別機制、活化途徑、細胞毒性效應，以及相關的實驗研究成果。
* **Translation:** Covers the cell biology and immunological characteristics of Natural Killer cells (NK cells), as well as their role in tumor immunology and antiviral immunity. Posts under this tag include information on cell recognition mechanisms, activation pathways, cytotoxic effects, and related experimental research findings.

**Key Considerations When Choosing:**

* **Target Audience:** Who are you writing for? General public? Scientists? Tailor the language accordingly.
* **Blog’s Focus:** Is your blog health-focused, scientific, or a mix? The description should complement your content.
* **Keyword Optimization:** While these are descriptions, they can slightly aid SEO. Consider subtly incorporating keywords like “免疫系統,” “癌症,” “病毒,” “免疫治療,” and “NK 細胞” if they fit.
* **Character Limit:** WordPress has no *hard* limits on descriptions, but it’s good practice to keep them relatively concise (ideally fitting within a few sentences).

**How to Add the Description in WordPress:**

1. Go to your WordPress admin dashboard.
2. Go to “Posts” -> “Tags”.
3. Find the “自然殺手細胞” tag.
4. You’ll likely see a section for “Description” or “Tag Description”. Paste your chosen description into that field.
5. Click “Update” or “Save”.

Choose the description that best suits your blog’s style and target audience. Good luck!