Here are a few description options for the WordPress post_tag “被加數” (Bèijiāshù) in Traditional Chinese, catering to different levels of context and detail:

**Option 1: Concise and to-the-point (Best for general use):**

> 數學用語，指加法算式中被加的數。 Examples: 加數, 加總, 合計。

**Translation:** “Mathematical term referring to the number being added in an addition equation. Examples: Addend, sum.”

**Explanation:** This option is short, clear, and directly defines the term. It also gives a few related terms, making it helpful for users searching for related concepts.

**Option 2: Slightly More Detailed (Useful for clarification):**

> 數學概念：加法算式中，與加數相加的數字，稱為被加數。例如在算式 2 + 3 = 5 中，2 就是被加數。理解被加數是掌握加法運算的重要一步。

**Translation:** “Mathematical concept: The number added to the addend in an addition equation is called the augend (or the number being added). For example, in the equation 2 + 3 = 5, 2 is the augend. Understanding the augend is an important step in mastering addition operations.”

**Explanation:** This option provides a definition, an example, and emphasizes the importance of the concept, which is suitable for educational content.

**Option 3: Emphasis on Searching & Keywords (Best for SEO):**

> 被加數 – 在加法算式中，與加數相加的數字。學習數學，理解加法，掌握被加數、加數、和、總數等概念。查找更多關於加法、小學數學、數字概念、數理知識的文章，請瀏覽本站。

**Translation:** “Augend – The number being added to the addend in an addition equation. Learn mathematics and understand addition by mastering concepts like augend, addend, sum, and total. Browse our site for more articles about addition, elementary mathematics, number concepts, and mathematical knowledge.”

**Explanation:** This option includes keywords to enhance SEO, encouraging users to explore other related articles on that website.

**Important Considerations when choosing:**

* **Audience:** Who is your target audience? Are they students, teachers, parents, or a general audience interested in mathematics?
* **Purpose:** What is the content of the tagged posts? Is it educational, informative, or a mix of both?
* **Formatting:** Make sure the description is well-formatted within WordPress, with line breaks and clear organization as needed.
* **Consistency:** Use similar description styles for all of your tags for a consistent website appearance.

Choose the description that best fits the context of your WordPress post and website! Remember to also consider adding a general post description for SEO purposes.