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related to an atom or atoms 开始学习
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(biology) the part of a cell that contains most of the genetic information 开始学习
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a linking force that holds atoms or ions together in any molecule or crystal 开始学习
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the physical property in matter that causes it to experience a force in an electromagnetic field 开始学习
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(physics) the degree to which a substance is compacted, measured by dividing its mass by its volume 开始学习
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(physics) the universal force of attraction between any pair of objects with mass 开始学习
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(physics) any of the smallest units that energy or matter consists of, such as electrons, atoms, molecules, etc. 开始学习
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a feature or quality of something 开始学习
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a reaction or behaviour whose reason is innate, not a result of thinking 开始学习
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the chemical processes through which food is changed into energy for the body to use 开始学习
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related to evolution or the slow and gradual development of something 开始学习
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produced by or from or related to living things 开始学习
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(biology) the slow and gradual development of living things throughout the history of the earth 开始学习
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the complete set of genetic material of any living thing 开始学习
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a change in the structure of the genes of an individual that causes them to develop different physical features 开始学习
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an unhatched or unborn offspring in the process of development, especially a human offspring roughly from the second to the eighth week after fertilization 开始学习
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an animal or plant with parents that belong to different breeds or varieties 开始学习
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a cell or a group of cells created through a natural or artificial process from a source that they are genetically identical to 开始学习
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(of a living being) to produce offspring or more of itself 开始学习
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something that encourages an activity or causes a reaction in a person or thing 开始学习
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the act of producing a substance that exists in living beings 开始学习
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to increase the velocity of something 开始学习
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(of a solid) to become one with a liquid 开始学习
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a water-soluble chemical substance that contains Hydrogen and has a sour taste or corrosive feature with a PH less than 7 开始学习
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a light silver-gray metal used primarily for making cooking equipment and aircraft parts 开始学习
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a metallic chemical element that has a red-brown color, primarily used as a conductor in wiring 开始学习
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a heavy soft metal, used in making bullets, in plumbing and roofing, especially in the past 开始学习
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a substance that permits heat or electricity to pass through it or along it 开始学习
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a substance of small size and equal sides, formed naturally when turns to solid 开始学习
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a type of powder that is explosive, used in making bullets, bombs, etc. 开始学习
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an explosive that is very powerful 开始学习
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the different elements that form something or the arrangement of these elements 开始学习
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to release heat, light, sound, radiation, etc. 开始学习
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a narrow beam of light, heat, or other form of energy 开始学习
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a device that produces a powerful and concentrated beam of light that can be used in medical procedures, for cutting metal objects, etc. 开始学习
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an object that makes iron come toward it because of the magnetic field that it produces 开始学习
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referring to anything related to heat or temperature 开始学习
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to press two things together or be pressed together to become smaller 开始学习
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a machine that produces electricity by converting mechanical energy into electrical energy 开始学习
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to become gas or vapour from liquid 开始学习
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a space that is utterly devoid of matter 开始学习
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