Here are several descriptions for the WordPress post tag “寒流” (Hánliú, Cold Wave) in Traditional Chinese, ranging in style and detail:

**Option 1: Simple & Concise**

* **Description:** 指寒冷氣團南下，造成氣溫劇烈下降的天氣現象。 (Measures the weather phenomenon where cold air mass is coming south, so temperature drops drastically.)

**Option 2: More Descriptive**

* **Description:** 寒流指的是冬季時來自北方地區的寒冷氣團，快速南下影響，導致氣溫驟降，常伴隨強風、濕冷，對人體的健康及日常生活造成影響。 (Cold Wave refers to a cold air mass that comes from northern regions during winter, moving south rapidly, which leads to a sudden temperature decrease. It often accompanies strong wind and damp cold, impacting human health and daily life.)

**Option 3: Focusing on Impact and Awareness**

* **Description:** 寒流來襲！了解寒流的特性、影響及如何應對。從保暖措施到預防疾病，一起做好準備，安全度過寒冷的冬季。 (Cold Wave is coming! Learn about the features, impacts, and how to cope with it. From warm measures to preventing illness, prepare together and get through the cold winter safely.)

**Option 4: More Specific (if related to a particular geography)**

* **Description:** [若文章與特定地區氣候相關，在此添加地區名稱]，寒流南下造成氣溫驟降，帶來嚴寒天氣。瞭解影響及應對措施，確保安全與健康。(For example, “台灣的寒流”). The Cold Wave descends, causing a sudden temperature drop and bringing a harsh winter. Understand the impacts and the response to ensure safety and health.

**Option 5: For a broader audience**

* **Description:** 寒流，冬季常見的天氣現象。 本標籤包含有關寒流的所有訊息，包括其成因、預報、影響以及如何保護自己。 (Cold Wave, also a common weather phenomenon of Winter. This tag contains all the informations concerning cold wave, including its formation, forecast, effect and how to take care of yourself.)

**Key things considered while writing these descriptions:**

* **Accuracy:** Defining what “寒流” fundamentally *is*.
* **Clarity:** Making the information easy to understand.
* **Relevance:** Tailoring it to what someone looking up the tag would likely want to know.
* **Language Level:** Accessible to a general audience who might be unfamiliar with meteorological terms (use simpler vocab if necessary)
* **Context:** The best option depends on the specific content of your WordPress posts.

**How to Choose the Best Option:**

1. **Consider the Content:** What topics are you primarily covering in the posts tagged with “寒流”? Is it general weather information, health tips, specific region information, or something else?
2. **Think About Your Audience:** Are they weather enthusiasts, or are you targeting a broader audience looking for practical advice?
3. **Character Count:** WordPress has no specific character limit for a tag’s description. But you will want to be concise enough for it not to be cut off in most themes/layouts.

Choose the description that best reflects the content you are writing about and the needs of your intended audience. Don’t be afraid to adjust it later if necessary!