Here are a few options for the post tag description, catering to different purposes:

**Option 1: General & Concise**

* **Description:** 學習英文單字，提升英語詞彙量，輕鬆掌握英文。 (Learn English vocabulary, improve your English vocabulary, and easily grasp English.)
* **Purpose:** Broad and suitable for any post discussing English vocabulary.

**Option 2: Descriptive & Focused**

* **Description:** 所有與英文單字相關的文章，包括單字列表、學習技巧、發音指南，以及常見錯誤解析。 讓你在英語學習路上更上一層樓。 (All articles related to English vocabulary, including vocabulary lists, learning techniques, pronunciation guides, and common error analysis. Help you to advance on your English learning journey.)
* **Purpose:** Attracts readers who are specifically looking for resources related to vocabulary, makes the tag content more specific to the target audiences, and promises the reader resources to learn.

**Option 3: Action-Oriented & Encouraging**

* **Description:** 想增強你的英文單字能力？加入這個標籤，探索有趣的單字學習方法，一步一步地擴展你的詞彙表！ (Want to improve your English vocabulary skills? Join this tag and explore fun ways to learn vocabulary, step by step expanding your vocabulary list!)
* **Purpose:** Motivates readers to click on the tag and explore the associated content, and emphasizes the goal of vocabulary expansion.

**Option 4: Simple & Keyword-Rich**

* **Description:** 英文單字, 英語學習, 詞彙, 字彙, 學習技巧, 單字列表. (English Vocabulary, English Learning, Lexicon, Words, Learning Techniques, Vocabulary Lists.)
* **Purpose:** Good for SEO and helps search engines understand what the posts tagged with “英文單字” are about.

**How to Choose:**

* **Consider your Audience:** Who are you trying to reach? (Beginners? Advanced learners?)
* **Think about Content Scope:** What kind of posts will you be tagging with this?
* **Prioritize Clarity & Keywords:** Make it easy for readers to understand the tag’s purpose and for search engines to index it correctly.

**Recommendation:**

I recommend Option 2 or Option 3. They are descriptive and target the audience effectively, while subtly suggesting value.

When adding the description in WordPress, make sure to go to Posts -> Tags -> and then edit the “英文單字” tag. You’ll find the space to add the description there.