Here are a few options for a WordPress post_tag description for “空間幾何” in Traditional Chinese, ranging from simple to slightly more descriptive, depending on your needs:

**Option 1: Simple and Direct (Good if space is limited)**

* **Description:** 探討空間中的形狀、大小和相對位置。 (Tàn tǎo kōng jiān zhōng de xíng zhuàng, dà xiǎo hé xiāng duì wèi zhì.) – Exploring shapes, sizes, and relative positions in space.

**Option 2: Slightly More Descriptive**

* **Description:** 空間幾何學 (Kōng jiān jǐ hé xué) 的相關文章，涵蓋三維空間、立體圖形、以及空間關係的知識。 (Xiāng guān de wénzhāng, hánggài sān wéi kōng jiān, lì tǐ túxíng, yǐjí kōng jiān guānxi de zhīshì.) – Articles related to spatial geometry, covering three-dimensional space, solid shapes, and spatial relationships.

**Option 3: Emphasizing Relevance (Good for drawing in relevant readers)**

* **Description:** 深入理解空間幾何 – 探索立體世界、三角、體積計算等內容，適用於數學學習、工程設計和藝術創作等領域。 (Shēnrù liǎojiě kōng jiān jǐ hé – tànsuǒ lìtǐ shìjiè, sānjiǎo, tǐjī jìsuàn děng nèiróng, shìyòng yú shùxué xuéxí, gōngchéng shèjì hé yìshù chuàngzuò děng lǐngyù.) – Deep understanding of spatial geometry – exploring the solid world, triangles, volume calculations, and more, applicable to mathematics learning, engineering design, and artistic creation.

**Option 4: Very Brief (If you prefer a cleaner look)**

* **Description:** 空間幾何的相關內容。 (Kōng jiān jǐ hé de xiāng guān nèiróng.) – Related content on spatial geometry.

**Choosing the Best Option:**

* **Consider length:** WordPress often limits the description length. Opt for a concise description if you expect to need many tags.
* **Audience:** Who are you writing for? Is this for students, professionals, or a general audience? Tailor the language accordingly.
* **SEO:** If search engine optimization is a priority, include keywords in the description (like “三維空間” (three-dimensional space), “立體圖形” (solid shapes) etc.).

I recommend starting with Option 2 or 3 for a good balance and then adjusting based on your site’s overall style and the specific articles you’re tagging. Remember to also include the translation if you want the user to readily know what the tag means.