The body's circulatory system includes the heart and blood vessels.人体的循环系统包括心脏和血管。
The heart pumps blood to all parts of the body through a network of arteries and veins.心脏通过动脉和静脉网络将血液输送到身体的各个部位。
The digestive system breaks down and absorbs food into the body.消化系统分解，把食物吸收到体内。
It's supplies the energy that the body needs for growth and repair.它提供身体生长和修复所需的能量。
After digestion, excess food is turned into waste and eliminated from the body.消化后，多余的食物就会变成废物，从体内排出。
The nervous system includes the brain, spinal cord and nerves.神经系统包括大脑、脊髓和神经。
This is your body's control system.这是你身体的控制系统。
It controls your muscles and organs, including your circulatory and digestive systems.它控制你的肌肉和器官，包括你的循环和消化系统。
The respiratory system includes the nose and lungs.呼吸系统包括鼻子和肺。
It brings air and oxygen into the body and removes carbon dioxide.它将空气和氧气带入人体，并清除二氧化碳。
The lungs are where oxygen enters the blood stream, and carbon dioxide is removed.肺是氧气进入血液，二氧化碳被排出的地方。
The immune system protects the body against infections and diseases.免疫系统保护身体免受感染和疾病。
Sneezing and fever are examples of how the immune system works.打喷嚏和发烧是免疫系统如何工作的例子。
If an infection invades the body, the immune system attacks it.如果感染侵入人体，免疫系统就会攻击它。
The blood vessels that carry oxygen-rich blood from the heart are called arteries.从心脏输送富氧血液的血管叫做动脉。
The digestive system is where food is broken down and absorbed into the body.消化系统是食物被分解和吸收到身体的地方。
The nervous system regulates your heartbeat and digestion.神经系统调节你的心跳和消化。
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