Here are a few options for a WordPress post tag description for “e-bill” in Traditional Chinese, ranging in formality and detail, along with explanations:

**Option 1: Concise and Direct (Most Common)**

* **Title:** e-bill (e-bill)
* **Description:** 電子帳單 (Diànzǐ zhàngdān) – 指透過數位方式接收和支付的帳單。 (Refers to bills received and paid digitally.)

* **Explanation:**
* `電子帳單 (Diànzǐ zhàngdān)`: This is the direct translation of “e-bill” – Electronic Bill.
* `- 指透過數位方式接收和支付的帳單。 (Refers to bills received and paid digitally.)`: Provides a clear and concise explanation of what an e-bill is.

**Option 2: Slightly More Descriptive**

* **Title:** e-bill (e-bill)
* **Description:** 電子帳單 (Diànzǐ zhàngdān) – 以數位形式提供的帳單，例如透過電子郵件或線上平台。 (Electronic bills provided in digital format, such as through email or online platforms.)

* **Explanation:**
* `電子帳單 (Diànzǐ zhàngdān)`: Electronic Bill.
* `- 以數位形式提供的帳單，例如透過電子郵件或線上平台。 (Electronic bills provided in digital format, such as through email or online platforms.)`: Adds examples to help users understand the context (email, online platforms).

**Option 3: Informal and User-Friendly**

* **Title:** e-bill (e-bill)
* **Description:** e-bill (電子帳單) – 輕鬆方便的數位帳單，讓你更方便地查看和支付賬單！ (Easy and convenient digital bills, making it easier for you to view and pay your bills!)

* **Explanation:**
* `e-bill (電子帳單)`: Includes both the English and Traditional Chinese versions.
* `- 輕鬆方便的數位帳單，讓你更方便地查看和支付賬單！ (Easy and convenient digital bills, making it easier for you to view and pay your bills!)`: This description uses more conversational language, emphasizing the benefits of using e-bills. It uses words like “輕鬆方便” (easy and convenient). It also includes “賬單” (zhàngdān) which means “bills” or “invoices”

**Option 4: Focusing on Saving Environment (Useful for environmentally friendly website)**

* **Title:** e-bill (e-bill)
* **Description:** 電子帳單 (Diànzǐ zhàngdān) – 使用電子帳單，減少紙張消耗，為環保盡一份心力! (Electronic bills reduce paper consumption and play a part for environmental protection.)

* **Explanation:**
* `電子帳單 (Diànzǐ zhàngdān)`: Electronic Bill.
* `- 使用電子帳單，減少紙張消耗，為環保盡一份心力! (Electronic bills reduce paper consumption and play a part for environmental protection.)`: Highlights the environmental benefits, appealing to users who care about this aspect.

**How to Choose the Best Option:**

* **Consider your audience:** Are you aiming for a general audience or a specific demographic? The more informal versions might be better for some audiences.
* **Purpose of the Tag:** What does the tag represent within your site? Is it for billing, tech, or environmental topics?
* **Character Limit:** WordPress tag descriptions have a character limit, so choose an option that fits within that constraint.

I recommend starting with **Option 1** or **Option 2** for its clarity and directness. Adapt it based on your website’s style and audience. You’ll also want to ensure your WordPress theme works correctly with Traditional Chinese fonts. Good Luck!