Here are a few options for the description of a WordPress post_tag “定期定額” in Traditional Chinese, along with explanations and considerations:

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

* **Description:** 每月固定金額投資。 (Měi yuè gùdìng jīn’é tóuzī.)
* **Translation:** Fixed monthly investment amount.
* **Explanation:** This is a straightforward and accurate description of the term “定期定額” (usually referring to a monthly fixed-amount investment). It’s readily understood and suitable for a broad audience.

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

* **Description:** 指每月以固定金額定期投資的理財方式，適合追求長期投資效益的投資人。 (Zhǐ měi yuè yǐ gùdìng jīn’é dìngqí tóuzī de lǐcái fāngshì, shìhé zhuīqiú chángqí tóuzī xiàoyì de tóuzī rén.)
* **Translation:** Refers to a financial method where a fixed amount is invested regularly each month, suitable for investors seeking long-term investment benefits.
* **Explanation:** This option provides a bit more context, mentioning the monthly frequency and the suitability for long-term investors. It’s a good choice if you want to provide some additional explanation within the tag description.

**Option 3 (Targeted for Beginners):**

* **Description:** 簡單來說，就是固定每月投入一樣的金額到投資標的，適合新手入門的懶人投資法。 (Jiǎndān lái shuō, jiù shì gùdìng měi yuè tóurù yīyàng de jīn’é dào tóuzī biāo dì, shìhé xīnshǒu rùmén de lǎnrén tóuzī fǎ.)
* **Translation:** Simply put, it’s investing the same amount into an investment target every month, suitable for beginners as a lazy investment method.
* **Explanation:** This is tailored for a beginner audience, simplifying the concept and using friendly language (“懶人投資法,” Lazy Investment Method) to encourage understanding.

**Option 4 (Focusing on Dollar-Cost Averaging):**

* **Description:** 透過定期定額投資，分散進場時機，減輕市場波動風險，降低投資成本。 (Tōngguò dìngqí dìng’é tóuzī, fēnsàn jìnchǎng shíjī, jiǎnqīng shìchǎng bōdòng fēngxiǎn, jiàngdī tóuzī chéngběn.)
* **Translation:** Through regular fixed-amount investment, it diversifies the entry timing, alleviates the risk of market fluctuations, and reduces investment costs.
* **Explanation:** This option emphasizes the benefits of “定期定額” like Dollar-Cost Averaging effect, focusing on the risks involved. Good for more detailed articles.

**How to Choose the Best Description:**

* **Target Audience:** Consider who your blog’s audience is. Are they beginners, experienced investors, or a mix?
* **Blog Content:** What is the overall tone and focus of your blog? Do you want to be simple and concise, or provide more detailed explanations?
* **Keywords:** If you’re optimizing for SEO, include relevant keywords like “投資” (investment), “理財” (financial management), and other related terms. However, the description provided is sufficient for basic SEO.

**Recommendation:**

For most cases, **Option 1** is a great starting point because it’s simple, clear, and accurate. You can adapt it slightly to fit your specific blog’s needs, and also add keywords. For a more detailed analysis, **Option 2** or **4** would be better suited. For a more layman approach use **Option 3**.

When you create the tag in WordPress, you’ll typically find a “Description” field where you can enter one of these options. Remember to click “Update Tag” after adding the description. Good luck with your blog!