Here are a few options for the description of the WordPress post_tag “有效” in Traditional Chinese, each with a slightly different nuance:

**Option 1 (General & Simple):**

* **Description:** 這個標籤用於標記與有效性、效能、或者具備實際效果相關的文章。 (Zhè ge biāoqiān yòngyú biāojì yǔ yǒuxiào xìng, xiàonéng, huòzhě jùbèi shíjì xiàoguǒ xiāngguān de wénzhāng.)
* **Translation:** This tag is used to mark articles related to effectiveness, performance, or having practical effects.

**Option 2 (Emphasizing Practicality):**

* **Description:** 標示文章內容在實際應用上有所價值、能解決問題，或者提供有效解決方案。 (Biāoshì wénzhāng nèiróng zài shíjì yìngyòng shàng yǒu suǒ jiàzhí, néng jiějué wèntí, huòzhě tígōng yǒuxiào jiějué fāng’àn.)
* **Translation:** This indicates that the article’s content is valuable in practical application, can solve problems, or provides an effective solution.

**Option 3 (Focusing on Results):**

* **Description:** 涵蓋討論帶來成果、產生效益，或者具備實質作用的文章。 (Hángài tǎolùn dàilái chéngguǒ, chǎnshēng xiàoyì, huòzhě jùbèi shízhì zuòyòng de wénzhāng.)
* **Translation:** Encompasses articles discussing results, producing benefits, or having substantial effects.

**Option 4 (More Specific, if appropriate):**

* **Description:** 標註相關文章，其內容符合特定標準，能夠實際履行其期望的功能。 (Biāozhù xiāngguān wénzhāng, qí nèiróng fúhé tèdìng biāozhǔn, nénggòu shíjì lǚxíng qí qídài de gōngnéng.)
* **Translation:** Marks related articles whose content meets specific standards and can practically fulfill their expected functions.

**Key Considerations when Choosing:**

* **Context:** Consider the overall theme of your website and the content you’re tagging. What kind of articles will commonly use this tag?
* **Specificity:** The more specific the description, the clearer it is to users what the tag represents. However, a general description can be more versatile.
* **Target Audience:** Ensure the language is clear and understandable for your target audience.

Choose the option that best suits your needs and the context of your WordPress website. You can also adjust the wording slightly to perfectly fit your specific requirements. Remember to add the description in the “Description” field when creating/editing the tag in your WordPress admin panel. Good luck!