Here are a few descriptive options for a WordPress post_tag titled “簡訊驗證碼” (SMS Verification Code) in Traditional Chinese, varying in length and focus:

**Option 1: Concise & Direct**

> 說明：使用簡訊 (SMS) 傳送的驗證碼，用於確認手機號碼、帳戶安全等。

* **Translation:** Description: SMS (Short Message Service) verification code used to confirm phone numbers, account security, etc.
* **Focus:** Most straightforward and clear. Good for internal organization.

**Option 2: Slightly More Informative**

> 說明：透過手機簡訊收取的驗證碼，用於完成註冊、登入、重設密碼等重要操作，保障帳戶安全。

* **Translation:** Description: Verification code received via mobile SMS, used to complete important operations such as registration, login, and password resets, to protect account security.
* **Focus:** Highlights the purpose and security implications. More user-friendly.

**Option 3: Emphasis on Technology and Implementation**

> 說明：網站或應用程式透過 SMS 傳送的六位數或多位數驗證碼，用於驗證使用者身份，確保身份與操作一致。

* **Translation:** Description: A six-digit or multi-digit verification code sent via SMS by websites or applications, used to verify user identities and ensure consistency between the identity and actions.
* **Focus:** Provides technical details of its implementation. Best for a tech-savvy audience.

**Option 4: Focus on Keyword Optimization**

> 說明：簡訊驗證碼是必要的安全措施！ 了解如何透過 SMS 接收 OTP (一次性密碼)，保障你的帳戶安全。 包含 SMS 註冊、簡訊登入等相關資訊。

* **Translation:** Description: SMS verification codes are necessary security measure! Learn how to receive OTPs (one-time passwords) via SMS to secure your account. Includes information related to SMS registration and SMS login.
* **Focus:** Targets relevant SEO keywords (“OTP”, “SMS 註冊”, “簡訊登入”) while also being user-friendly.

I recommend using **Option 2 or Option 4** as they are effective for both SEO and user comprehensibility. Choose the option that best aligns with your blog’s tone and target audience. Remember that the description appears on the backend of your WordPress site, so you’ll know how to use it properly.