efficiency的音標是[??f???ns?s]，基本翻譯是效率、效能。記憶技巧可以是：易發神（effi）仙（ci）的仙女姐姐，總是很有效率。

Efficiency這個詞的詞源可以追溯到拉丁語詞“efficientis”，意為“能產生效果的”。這個詞在英語中演變成為“efficient”，表示“有效率的”或“能產生預期效果的”。

變化形式：

1. Efficient - 名詞和形容詞形式，表示效率高的人或物。

2. Efficacy - 名詞形式，表示效果或效能。

相關單詞：

1. Economy - 詞源和 efficiency 相近，表示節約、經濟。

2. Effective - 形容詞形式，表示有效的、產生預期效果的。

3. Productive - 形容詞形式，表示生產效率高的。

4. Rational - 形容詞形式，表示理性的、合理的，有時也用來形容效率高的。

5. Speed - 名詞和形容詞形式，表示速度、效率。

6. Convenience - 名詞形式，表示便利、效率。

7. Efficiency Room - 名詞形式，表示效率室，常用于討論提高工作效率的地方或設施。

8. Resourceful - 形容詞形式，表示機智的、善于利用資源的。

9. Efficiently - 副詞形式，表示有效地、高效地。

10. Efficacious - 形容詞形式，表示有功效的、有效的，有時也用來形容效率高的。

常用短語：

1. efficiency in production

2. efficiency in operation

3. high efficiency

4. low-efficiency equipment

5. energy efficiency

6. resource utilization efficiency

7. efficiency improvement

例句：

1. The factory has achieved high efficiency in production thanks to the new production line.

2. The efficient operation of the new machine has greatly improved our work efficiency.

3. The old equipment is inefficient and needs to be replaced with new ones.

4. We need to improve our resource utilization efficiency to reduce waste and increase profits.

5. Energy efficiency is becoming increasingly important as we try to reduce our carbon footprint.

6. Efficiency improvement is a continuous process that requires continuous effort and innovation.

英文小作文：

Efficiency is a crucial factor in any business or industry, whether it"s manufacturing, operations, or resource management. By increasing efficiency, we can reduce costs, increase productivity, and improve the overall performance of our organization.

In the manufacturing industry, for example, high efficiency in production can result in faster turnaround times, fewer defects, and increased profitability. Similarly, efficient operation of equipment can result in less downtime and increased output, leading to better overall performance of the organization.

However, achieving efficiency is not always easy, as it requires continuous effort and innovation. We need to identify bottlenecks and inefficiencies in our processes and work systems, and implement strategies and tools that can help us improve our efficiency levels.

In conclusion, efficiency is key to success in any industry or business, and it requires continuous effort and innovation to achieve it. By focusing on efficiency, we can improve our overall performance and achieve greater success in our organization.