The application of numerical control technology requires the use of English in the following aspects:

1. Reading and understanding English technical documents: To effectively use CNC technology, it is necessary to read and understand technical documents such as manuals, operation instructions, and software documentation in English.

2. Communicating with international suppliers and partners: In the process of purchasing CNC equipment, accessories, and software, it is essential to communicate with international suppliers and partners in English to ensure smooth transactions and technical support.

3. Participating in international conferences and seminars: Attending international CNC technology conferences and seminars requires proficiency in English to understand presentations, discussions, and exchange of ideas with professionals from around the world.

4. Research and development of CNC technology: Engaging in research and development of CNC technology often involves reading and writing scientific papers, patents, and technical reports in English.

5. Training and education: Providing training and education on CNC technology to students and professionals requires the use of English to convey technical concepts and instructions effectively.

In summary, the application of numerical control technology necessitates a certain level of English proficiency to ensure successful implementation, communication, and advancement in the field.