Here are a few options for the “外幣存款手續費” (Foreign Currency Deposit Handling Fee) WordPress post_tag description, ranging from concise to slightly more informative:

**Option 1 (Concise):**

> 外幣存款相關的費用，包括手續費、匯款費用等。 (Fees related to foreign currency deposits, including processing fees, remittance fees, etc.)

**Why this works:**

* Directly states the topic.
* Provides a general understanding of the subject matter.

**Option 2 (Slightly More Informative):**

> 探討外幣存款時可能產生的各種手續費，例如匯款手續費、存款提款手續費、帳戶管理費等，幫助您了解相關成本。 (Discussing various fees that might occur when making foreign currency deposits, such as remittance fees, deposit/withdrawal fees, account management fees, etc., to help you understand the related costs.)

**Why this works:**

* More specific about the types of fees.
* Emphasizes the value of understanding the fees.

**Option 3 (Focus on User Education):**

> 了解外幣存款手續費的細節，包括不同銀行的收費標準、影響費用的因素、以及如何節省相關費用。 (Understand the details of foreign currency deposit fees, including fee standards of different banks, factors affecting the fees, and how to save on related fees.)

**Why this works:**

* Addresses a potential user’s questions.
* Provides a more proactive approach to content.

**Option 4 (Targeting SEO):**

> 外幣存款手續費、銀行收費、匯款費用、外幣存款攻略。 了解不同的外幣存款手續費，比較各家銀行的收費，並掌握如何避免不必要的費用。 (Foreign currency deposit fees, bank charges, remittance fees, foreign currency deposit strategies. Understand different foreign currency deposit fees, compare fees from various banks, and learn how to avoid unnecessary fees.)

**Why this works:**

* Includes relevant keywords for SEO purposes.
* Concise and informative.

**Which one to choose depends on your overall WordPress site and content style.** If you have a general blog, options 1 or 2 might be suitable. If your focus is on in-depth guides, option 3 could align well. If SEO is crucial, option 4 offers a solid approach. Make sure it accurately represents the kind of content you’ll be tagging with this term.