The body's circulatory system includes the heart and blood vessels. The heart pumps blood to all parts of the body through a network of arteries and veins.
人体的循环系统包括心脏和血管，心脏通过动脉和静脉网络将血液输送至身体各部位。
The digestive system breaks down and absorbs food into the body. It's supplies the energy that the body needs for growth and repair. After digestion, excess food is turned into waste and eliminated from the body.
消化系统分解，为人体吸收食物养分，提供人体生长和修复所需的能量。消化后，多余的食物转换为废物，从体内排出。
The nervous system includes the brain, spinal cord and nerves. This is your body's control system. It controls your muscles and organs, including your circulatory and digestive systems.
神经系统包括大脑、脊髓和神经——这是人体的控制系统。控制肌肉和器官，包括循环和消化系统。
The respiratory system includes the nose and lungs. It brings air and oxygen into the body and removes carbon dioxide. The lungs are where oxygen enters the blood stream, and carbon dioxide is removed.
呼吸系统包括鼻子和肺，它将氧气带入人体，并清除二氧化碳。肺是氧气进入血液，排出二氧化碳的场所。
The immune system protects the body against infections and diseases. Sneezing and fever are examples of how the immune system works. If an infection invades the body, the immune system attacks it.
免疫系统保护人体免受感染和疾病，打喷嚏和发烧就是免疫系统工作的表现。如果感染入侵人体，免疫系统就会攻击它。
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