Here are a few description options for the WordPress post_tag “拋物線” (Parabola) in Traditional Chinese, catering to different tones and purposes:

**Option 1: Concise and Informative**

* **Description:** 數學中，由固定點（焦點）到固定直線（準線）的距離相等的點所構成的平面曲線。 (In mathematics, a plane curve formed by points equidistant from a fixed point (focus) to a fixed line (directrix).)

**Option 2: Focusing on Visual Representation**

* **Description:** 拋物線，呈U字形，代表著在重力作用下物體運動的自然軌跡，在物理、數學、甚至建築設計中皆有廣泛應用。 (The parabola, U-shaped, represents a natural trajectory of motion of an object under gravity. It’s widely used in physics, mathematics, and even in architectural design.)

**Option 3: Emphasizing the Concept for Educational Content**

* **Description:** 深入探討拋物線的奧秘。 了解數學上的定義、特性，以及在現實世界中的應用，例如投擲物體的路徑、反射鏡等的原理。 (Dive deep into the mysteries of the parabola. Understand its mathematical definition, properties, and applications in the real world, like the trajectory of projectiles, mirrors, etc.)

**Option 4: More General and Accessible**

* **Description:** 探索關於拋物線的所有內容：從數學的基本定義，到它有趣的應用，例如在體育運動、科技和藝術中可以找到拋物線的蹤影。 (Explore everything about parabolas: from the basic mathematical definition to its interesting applications, such as the presence of parabolas in sports, technology, and art.)

**Option 5: (Slightly More Technical if the content is technical)**

* **Description:** 探討拋物線的方程、焦點、準線、頂點等關鍵要素, 以及如何運用解析幾何和微積分來研究其性質。 (A discussion of key elements of the parabola like its equation, focus, directrix, and vertex, as well as how analytic geometry and calculus are used to study its properties.)

**Key Considerations when choosing:**

* **Target Audience:** Who are you writing for? Math enthusiasts? General readers? Students?
* **Content of the Posts:** Does the post series focus on the math itself, or the real-world applications? This will influence the tone and keywords used.
* **Search Engine Optimization (SEO):** Make sure it includes relevant keywords (e.g., 焦點, 準線, 頂點, 重力, 數學) to help people find your posts.

**How to Use in WordPress:**

1. **Create the Tag:** In your WordPress admin panel, go to “Posts” -> “Tags.” Add the tag “拋物線” and one of the descriptions above.
2. **Assign the Tag:** When you write a new post, or edit an existing post, assign the tag “拋物線” to posts that are about the topic the most suitable description you’ve chosen when assigning in your post.