1. 原句：This paper aims to explore the potential of using drones for environmental monitoring.
降重修改后：The purpose of this research is to investigate the feasibility of utilizing drones in environmental observation.
2. 原句：The results indicate that there is a significant relationship between exercise and mental health.
降重修改后：The findings suggest a notable correlation between physical activity and psychological well-being.
3. 原句：The experiment was conducted to determine the effects of caffeine on heart rate.
降重修改后：The study was carried out to investigate the impact of caffeine consumption on cardiovascular function.
4. 原句：The literature review identifies several key issues in the field of sustainable tourism.
降重修改后：The review of prior studies reveals critical concerns regarding sustainable tourism.
5. 原句：The research methodology involved surveying a sample of over 100 participants.
降重修改后：The approach to data collection entailed surveying a sample exceeding 100 individuals.
