Here are a few options for the WordPress post tag description, depending on the specific context of your website:

**Option 1: General & Simple (Best for websites focusing on products or general information)**

* **Description:** 了解物品的尺寸、大小。包括長度、寬度、高度及重量等。
* **Translation:** Understand the dimensions and sizes of items. Includes length, width, height, and weight, etc.

**Option 2: Focusing on different units (Good if your site deals with measurements like clothing or home goods)**

* **Description:** 探索不同尺寸大小的單位，如厘米、英寸、尺碼等。
* **Translation:** Explore different size units, such as centimeters, inches, and sizes, etc.

**Option 3: More detailed description for a wider audience (Useful if the topics are more varied)**

* **Description:** 關於物品尺寸大小的相關資訊，包括測量方法、尺寸規格、及尺寸對產品的影響。 幫助您挑選商品、或了解物品的實際大小。
* **Translation:** Information related to item sizes, including measurement methods, size specifications, and the impact of size on products. Helps you choose products or understand the actual size of items.

**Option 4: Concise & Direct (Good if you are space constrained and just want a quick description)**

* **Description:** 產品的尺寸和大小相關資訊。
* **Translation:** Information about the product’s dimensions and size.

**Key Considerations When Choosing:**

* **Website Content:** What kind of content does the website offer associated with this tag? (Products, Measurement guides, articles)
* **Target Audience:** Who is your audience? (Beginners, experts, etc.)
* **Clarity & Specificity:** Make sure the description clearly conveys the meaning of the tag.
* **Character Count:** Post tag descriptions typically has a limitation in the number of characters.

I suggest starting with **Option 1 or 2**, tailoring it depending on your site! Remember to update this description when you have more information about your website!