Here are a few options for the description of a WordPress post tag with the title “空單” (Kōng dān, meaning “Short Position” or “Short Sale” in Cantonese and Mandarin):

**Option 1 (Concise & Informative):**

> 了解股票、期貨等金融市場中的「空單」策略。 這標籤涵蓋如何透過賣出借入的資產以期望價格下跌來獲利的內容。

> This tag explores the “short position” strategy in financial markets like stocks and futures. It covers how to profit by selling borrowed assets with the expectation of a price decline.

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

> 探索「空單」的世界，了解如何在市場下跌時也能獲利。 標籤下的文章將探討空單策略的運作方式、風險管理，以及相關的交易技巧，包括期貨空單、股票空單等。

> Explore the world of “short positions” and learn how to profit even when the market declines. The articles under this tag will discuss how short selling strategies work, risk management, and related trading techniques, including short selling futures, short selling stocks, etc.

**Option 3 (Focus on Educational Content):**

> 學習「空單」策略，在金融市場中更上一層樓！ 這個標籤旨在幫助你掌握空單的基本概念、交易技巧，以及實用案例分析，助你在熊市或市場修正時期也能把握盈利機會。

> Learn about “short position” strategies and take your financial market knowledge to the next level! This tag aims to help you master the basic concepts, trading skills, and practical case studies related to short selling, enabling you to seize profit opportunities even during bear markets or market corrections.

**Option 4 (Targeting a Specific Audience – e.g., Beginners):**

> [針對初學者適用] 什麼是「空單」？ 這裡有淺顯易懂的解說，讓你輕鬆入門股市和期貨交易世界，了解如何借入資產並賣出，期望價格下跌。

> [For Beginners] What are “short positions”? Here’s an easy-to-understand explanation to help you easily get started in the world of stock and futures trading, understanding how to borrow assets and sell them in anticipation of a price decline.

**Key Considerations When Choosing:**

* **Target Audience:** Who are you writing for? Beginners? Experienced traders?
* **Content of Posts:** What kind of content will be under this tag? Educational articles, news analysis, trading tips, etc.?
* **SEO:** Think about relevant keywords people might use to search for this concept (e.g., “做空”, “做空策略”, “short selling”, “股票空單”).
* **Length:** WordPress tag descriptions can be a few sentences, so keep it concise while explaining the essence.

Choose the description that best aligns with your intended audience and the content you plan to tag with “空單.” You can also adjust these suggestions to fit your specific needs. Remember to include the English transliterations if you think your target audience might be international.