"extensions"的音標為[?k?stens?nz] 。"extensions"的基本翻譯為"擴大，延伸；擴展物；延伸部分"。速記技巧為在記憶時可結合其發音特點，著重記憶其發音特點以及與其相關的詞匯搭配等。

以下是關于“extensions”的英文詞源、變化形式以及相關單詞的解釋和說明，希望對您有所幫助：

詞源：extensions這個詞源于拉丁語中的“extendere”，意為“伸展”或“擴展”。

變化形式：extensions可以有不同的形式，如單數形式的“extension”和復數形式的“extensions”。

相關單詞及其解釋：

1. Extensive：廣泛的，大量的。這個詞可以用來形容范圍廣、數量多的情況。

2. Extention：n. 延伸；擴展；伸展。這個詞是單數形式的“extension”的拼寫，可以用來表示物體向某一方向延伸的情況。

3. Extensive reading：泛讀；課外閱讀。這個詞指的是在課余時間進行的廣泛閱讀，以提高閱讀能力和擴大知識面。

4. Extensive knowledge：廣博的知識。這個詞指的是擁有廣泛領域知識的狀態。

5. Expand：v. 擴大；使擴張；使膨脹。這個詞是“extend”的動詞形式，可以用來表示物體向外擴張或擴大規模的情況。

6. Expansion：n. 擴張；擴大；膨脹。這個詞可以用來表示物體向外擴張或擴大的過程。

7. Expanded：adj. 擴大的；展開的；展開狀態的。這個詞可以用來形容物體已經擴張或展開的狀態。

8. Extension cord：延長線；延長電纜。這個詞指的是用于延長電器設備電源線的工具。

9. Extension call：電話延伸服務。這個詞指的是通過電話線路提供的額外服務，如傳真、數據傳輸等。

10. Extension phone：電話分機；分機電話。這個詞指的是電話系統中用于連接其他電話的分機設備。

以上這些單詞都與“extensions”有著密切的聯系，通過了解它們的詞源、變化形式和含義，可以幫助我們更好地理解和使用這個詞匯。

常用短語：

1. extension cord (延長線)

2. extension phone (電話分機)

3. extension number (分機號碼)

4. extension cord extension (延長延長線)

5. extension of credit (信用延期)

6. extension of term (學期延長)

7. extension of time (延期交貨)

例句：

1. I plugged in my extension phone and dialed the number.

2. The teacher gave an extension on the exam and we had more time to study.

3. We need to extend the deadline for the project by a week.

4. The company is considering extending the credit to the customer.

5. The extension cord is too short to reach the plug.

6. The extension phone is a convenient way to communicate with colleagues.

7. The extension number is printed on the back of the phone.

英文小作文：

標題：Extension Cord - A Useful Tool in Our Daily Life

Extension cords are small cables that are used to connect electronic devices to power outlets or other devices. They are a necessary tool for ensuring that electronic devices can be used without interruption and without causing damage to the power system or other devices.

In our daily lives, we use extension cords to power our computers, phones, lamps, and other electronic devices. They are also used in businesses and factories to connect equipment and machines to power sources, ensuring that they can operate efficiently and safely.

However, extension cords can also pose a safety hazard if they are not used properly or if they are damaged. Therefore, it is important to always use a quality extension cord that is rated for the specific device being used and to follow all safety guidelines when using them.

In conclusion, extension cords are a useful tool that we use in our daily lives to ensure that electronic devices can be used without interruption and without causing damage. They are also essential for businesses and factories to operate efficiently and safely.