Here are a few options for a description of the “關鍵詞” (Guānjiàn cí) WordPress post_tag, depending on the desired tone and purpose:

**Option 1: Simple and Informative**

> 標記關鍵詞。這標籤列出了文章中重要的搜索詞，幫助您快速找到相關內容。 (Biāo jì guānjiàn cí. Zhè biāo qiān liè chū le wénzhāng zhōng zhòngyào de sōu suǒ cí, bāngzhù nín kuàisù zhǎodào xiāngguān nèiróng.)
>
> *Translation: Marks keywords. This tag lists the important search terms in the article, helping you quickly find related content.*

**Option 2: Slightly more detailed and user-friendly**

> 關鍵詞彙，方便查找。 使用這個標籤，您可以輕鬆找到與特定主題或概念相關的文章。 我們精心挑選了每個文章中最關鍵的詞彙。 (Guānjiàn cíhuì, fāngbiàn cházhǎo. Shǐyòng zhège biāoqiān, nín kěyǐ qīngsōng zhǎodào yǔ tèdìng zhǔtí huò gàiniàn xiāngguān de wénzhāng. Wǒmen jīngxīn tiāoxuǎn le měi gè wénzhāng zhōng zuì guānjiàn de cíhuì.)
>
> *Translation: Keywords for easy search. Use this tag to easily find articles related to a specific topic or concept. We carefully select the most important keywords for each article.*

**Option 3: Focused on search engine optimization (SEO)**

> 為SEO優化而設的關鍵詞標籤。 這些關鍵詞旨在幫助搜索引擎更好地理解文章，提高其在搜索結果中的排名，讓更多人找到您的文章！ (Wèi SEO yōuhuà ér shè de guānjiàn cí biāoqiān. Zhèxiē guānjiàn cí zhǐ zài bāngzhù sōusuǒ yǐnqíng gèng hǎo de lǐjiě wénzhāng, tígāo qí zài sōusuǒ jiéguǒ zhōng de páimíng, ràng gèng duō rén zhǎodào nín de wénzhāng!)
>
> *Translation: Keyword tag set for SEO optimization. These keywords are designed to help search engines better understand the article and improve its ranking in search results, allowing more people to find your articles!*

**Option 4: Concise and action-oriented**

> 關鍵詞：快速檢索文章的關鍵字。 點擊這些字詞，探索更多相關內容。 (Guānjiàn cí: Kuàisù jiǎnsuǒ wénzhāng de guānjiànzì. Diǎnjī zhèxiē zìcí, tànsuǒ gèng duō xiāngguān nèiróng.)
>
> *Translation: Keywords: the key words for quickly searching articles. Click on these words to explore more related content.*

**Choosing the Best Option:**

Consider the context of your WordPress website and your audience:

* **Option 1 & 4:** Best for general use and simple explanation.
* **Option 2:** Good if you want to emphasize user benefit.
* **Option 3:** Recommended if you want to highlight the SEO aspect of the tag.

You can also adapt these based on your specific needs. Good luck!