Here are a few options for the `post_tag` description in Traditional Chinese, with varying levels of detail and conciseness:

**Option 1: Concise & Direct**

* **Description:** 為悠遊卡輕鬆儲值，方便搭乘大眾運輸、消費付款。 (Easy top-up for your EasyCard, convenient for public transport and purchases.)

**Option 2: Slightly More Informative**

* **Description:** 了解悠遊卡儲值方式，包含自動加值、現金儲值等，讓您隨時隨地輕鬆儲值。 (Learn about EasyCard top-up methods, including automatic top-up, cash top-up, etc., allowing you to top up your card easily anytime, anywhere.)

**Option 3: Keyword-Focused (for SEO)**

* **Description:** 悠遊卡儲值資訊，包括捷運儲值、超商儲值、悠遊卡自動加值等，掌握各種儲值方式，讓您的悠遊卡使用更便利。 (EasyCard top-up information, including MRT top-up, convenience store top-up, EasyCard automatic top-up, etc., master various top-up methods, making your EasyCard use more convenient.)

**Option 4: Emphasis on User Benefit**

* **Description:** 告別排隊煩惱！輕鬆掌握悠遊卡儲值秘訣，隨時隨地為您的悠遊卡加值，享受便捷生活。 (Say goodbye to queuing woes! Easily master the tips for EasyCard top-up, top up your EasyCard anytime, anywhere, and enjoy a convenient life.)

**Key Considerations When Choosing:**

* **Keyword Use:** Consider what users might search for. Options 3 and 4 includes targetted keywords.
* **Target Audience:** Who is your primary audience? Are they tech-savvy, or do they need more hand-holding?
* **Length:** WordPress tags don’t typically have a character limit, but shorter is often better for readability, unless you are leaning towards SEO.
* **Context:** What kind of content will your tag cover? Use the description to reflect that.

I recommend option 3 or 4 if you are aiming for better SEO, or option 1 if you prefer brevity. Choose the one that best reflects your website and the content covered by the tag.