digestive system and respiratory system

例句：

1. 1.The digestive system is responsible for breaking down food and converting it into energy.
   消化系统负责将食物分解并转化为能量。
2. 2. A healthy digestive system can help prevent diseases caused by poor diet.
   一个健康的消化系统可以帮助预防由于不良饮食引起的疾病。
3. 3. The digestive system plays a crucial role in the body's overall health.
   消化系统在身体的整体健康中起着至关重要的作用。
4. 1. The respiratory system is responsible for breathing air into the lungs.
   呼吸系统负责将空气吸入肺部。
5. 2. A healthy respiratory system can help prevent infections caused by poor air quality.
   一个健康的呼吸系统可以帮助预防由于空气质量差引起的感染。
6. 3. The respiratory system plays a crucial role in maintaining good health.
   呼吸系统在维护良好健康中起着至关重要的作用。