Here are a few options for the description of the WordPress post_tag “跨境電商” in Traditional Chinese, catering to different levels of formality and focus:

**Option 1 (Simple and Direct):**

> 探索全球市場的必備關鍵字！了解跨境電商的最新動態、策略與趨勢。
>
> *(Translation: The essential keyword for exploring global markets! Learn about the latest developments, strategies, and trends in cross-border e-commerce.)*

**Option 2 (More Detailed and Informative):**

> 這裡匯集了所有關於跨境電商的資訊，包括如何拓展海外市場、選擇合適的平台、處理物流、支付以及應對法規等方面。無論您是新手或經驗豐富的賣家，都能找到有用的資源和建議。
>
> *(Translation: This is where all the information about cross-border e-commerce is gathered, including how to expand into overseas markets, choose the right platform, handle logistics and payments, and deal with regulations. Whether you’re a beginner or an experienced seller, you can find useful resources and suggestions here.)*

**Option 3 (Focus on Advantages and Benefits):**

> 跨境電商 (Cross-border e-commerce) – 開啟無限商機的大門！深入了解如何通過跨境電商，接觸全球消費者，提升品牌知名度，並實現業務增長。
>
> *(Translation: Cross-border e-commerce – Opening the doors to unlimited business opportunities! Learn how, through cross-border e-commerce, to reach global consumers, enhance brand awareness, and achieve business growth.)*

**Option 4 (Concise and Keyword-Focused):**

> 跨境電商 (Cross-Border E-Commerce): 國際貿易、全球銷售、電商平台、海外市場、物流、支付。
>
> *(Translation: Cross-border e-commerce: International trade, global sales, e-commerce platforms, overseas markets, logistics, payments.)*

**Choosing the Right Option:**

* **Consider your audience:** Who are you writing for? Are they beginners or experienced sellers?
* **Consider the purpose of your tag:** Do you want to give a brief overview or provide more detailed information?
* **Consider SEO:** Use keywords relevant to your target audience, e.g. “海外市場”, “國際貿易”, “電商平台”.

I recommend using **Option 2 or 3** as they provide a good balance of information and clarity. Option 4 is great if space is limited and you want to maximize keyword impact.