Here are a few options for the WordPress post tag description, considering varying levels of detail and potential SEO considerations:

**Option 1: Concise and Direct (Good for brevity)**

* **Description:** 掃墓 (Sào mù): 清明時節的掃墓活動，祭拜祖先，表達對逝去親人的思念和敬意。 (Sweeping of tombs: Activities during Tomb-Sweeping Day, offering sacrifices to ancestors to express remembrance and respect for the deceased.)

**Option 2: Slightly More Informative (Good for general understanding)**

* **Description:** 掃墓 (Sào mù) – 華人傳統習俗，在清明節或其它時間前往墓地，清理墓地、獻祭供品、焚燒紙錢，祭拜祖先，慎終追遠，緬懷逝者。 (Sweeping of tombs – A traditional Chinese custom, practiced during Tomb-Sweeping Day or other times, to visit the graves, clean the tomb, offer tributes, burn paper money, and pay respects to ancestors, in remembrance and respect of the deceased.)

**Option 3: SEO-Focused (Good for search engines)**

* **Description:** 掃墓 (Sào mù)：清明節的重頭戲，也是重要的節慶活動。瞭解掃墓的意義、習俗、祭拜流程，以及相關的禁忌和注意事項。 (Sweeping of tombs: The main event of Tomb-Sweeping Day and a significant festival activity. Learn about the meaning, customs, offerings, and associated taboos and precautions.) Keywords may appear more naturally than in the other suggestions.

**Option 4: Focusing on modern aspect (Good for current conversations)**

* **Description:** 掃墓 (Sào mù) – 在現代社會，掃墓不僅是緬懷祖先的方式，也聯繫了家族情感。 了解掃墓的意義、準備、禁忌， 以及環保掃墓的新趨勢。(In modern society, sweeping tombs is not only a way to commemorate ancestors, but also connects family bonds. Learn about the meaning, preparation, taboos, and new trends of environmental-friendly sweeping.)

**Key factors considered:**

* **Title Consistency:** The description directly uses “掃墓” to match the tag’s title.
* **Clarity:** The descriptions provide context in both Traditional Chinese and, in Option 1 and 2, an English translation for clarity to a wider audience.
* **Keywords (SEO):** Option 3 subtly incorporates the general scope of the term, allowing for the possible inclusion of the word “清明節” (Qingming Festival), which is very common.
* **Cultural Sensitivity:** They explain the customs without being overly detailed or potentially offensive.
* **Flexibility:** You can adapt these descriptions further by adding subtopics (like specific aspects of the culture) as your blog posts become richer.

When choosing, consider:

* **Your audience:** Who are you writing for?
* **Your SEO goals:** Do you need to optimize for search engines?
* **Post content:** Does your content lean towards something specific, like customs, ethics, or eco-friendly practice?

I recommend starting with Option 2, since it provides a good balance, and consider refining it further based on your needs.