增强信心在英语中可以说成 "boost one's confidence" 或者 "increase one's confidence"。以下是几种不同的表达方式：
1、口语表达：
- Boost your confidence.
- Build up your confidence.
- Enhance your confidence.
- Strengthen your confidence.
2、书面表达：
- To boost one's confidence.
- To build up one's confidence.
- To enhance one's confidence.
- To strengthen one's confidence.
3、例句：
- You need to boost your confidence before the big presentation.
- This training program is designed to build up your confidence in public speaking.
- She worked hard to enhance her confidence in her mathematical abilities.
- The coach's encouraging words strengthened the team's confidence for the match.
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