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a part of the body that makes and releases substances like hormones. 开始学习
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a chemical made by the body that gives you energy and helps you react quickly in scary or stressful situations. 开始学习
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the tiny building blocks that make up all living things. 开始学习
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the organ that pumps blood around your body. 开始学习
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a chemical made by glands that helps control how the body works. 开始学习
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organs in your chest that help you breathe by taking in oxygen and getting rid of carbon dioxide. 开始学习
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to let something out or set it free. 开始学习
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a feeling of worry or pressure that can happen when you're in a hard situation. 开始学习
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to try to protect yourself or win by using force or strength. 开始学习
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running away or escaping from danger. 开始学习
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the front part of your body between your neck and stomach, where your heart and lungs are. 开始学习
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a sudden increase in strength or power to help you act quickly. 开始学习
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a fast, strong feeling or movement, often caused by excitement or chemicals in the body. 开始学习
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the red liquid that flows through your body and carries oxygen and nutrients. 开始学习
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parts of your body that help you move and get stronger when you use them. 开始学习
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the air you take in and out of your lungs when you breathe. 开始学习
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power or strength that is much greater than what people normally have. 开始学习
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the part of your body inside your head that controls thoughts, feelings, and actions. 开始学习
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to focus and listen or look carefully at something. 开始学习
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very intense or severe in degree 开始学习
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the possibility of something bad or dangerous happening 开始学习
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likely to cause harm or injury 开始学习
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the activity of jumping into water from a high cliff 开始学习
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a board over a swimming pool used for diving 开始学习
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a person who dives in sports contests 开始学习
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a person who jumps from high cliffs into water 开始学习
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开始学习
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with the head going in front of the rest of the body 开始学习
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jumping from fixed objects using a parachute (building, antenna, span, earth) 开始学习
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a person with special education and skills for their job 开始学习
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a device used to slow down a fall from a high place 开始学习
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a structure with a roof and walls 开始学习
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a structure built to span over water or a gap 开始学习
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the act of saving someone from danger 开始学习
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to have permission to do something 开始学习
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be allowed to do something
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a rope or wire high above the ground used for walking in performances 开始学习
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a performer who does acrobatics high in the air 开始学习
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a famous group of large waterfalls between the US and Canada 开始学习
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