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49美国人常用的1500个单词 wreck [(1) to damage greatly; (2) to destroy; (3) anything that has been badly damaged or broken] The storm wrecked many houses in the town. (1) The boy wrecked the family car. (2) The house was a wreck after the wild party. (3) wreckage [what remains of something severely damaged or destroyed] Searchers found the wreckage of the airplane high on a mountain. write [to use an instrument to make words appear on a surface, such as paper] Please write a note to me with your new address. wrong [(1) not correct; (2) bad; (3) not legal; (4) opposite right] His answer is wrong. (1) He made the wrong decision. (2) It is wrong to steal her money. (3) She knew the difference between right and wrong. (4) <Y> year [a period of time equal to twelve months] We signed a work agreement for one year. yellow [having the color like that of gold or the sun] The skin of bananas is yellow. yes [used to express agreement or to permit] When he asked her to marry him, she said, "Yes." yesterday [the day before today] We talked yesterday about her problem. yet [(1) at some time before now; (2) now; (3) at this time; (4) however] Have they arrived yet? (1) Do not sit down yet. (2) I cannot tell you about it yet. (3) The sun was shining, yet it was cold. (4) you [the person or persons being spoken to] I am glad to see you. young [(1) in the early years of life; (2) not old] The young girl missed her mother. (1) He seemed too young to know so much. (2) zero [the number meaning none or nothing] One minus one equals zero. zoo [a place where animals are kept for the public to look at and study] We saw the new panda at the zoo. (COMMON EXPRESSIONS) a lot of [much or many] We had a lot of rain. carry out [to do; to put into effect] Please carry out the plan. pass a bill [approve] Congress is expected to pass a bill to cut taxes. take steps [to start to do something] The government will take steps to halt inflation. (WORDS USED IN VOA SPECIAL ENGLISH SCIENCE PROGRAMS) antibodies [special proteins, produced in the blood, that kill harmful bacteria] The body's defense system creates different antibodies for each disease it fights. atom [a very small part of all things; the smallest part of an element that can join with parts of other elements] All matter is made of atoms. bacteria [living things that are one cell and can be seen only through a microscope; some cause disease] Some bacteria cause disease. cell [a small mass of living material that is part of all plants and animals] All plants and animals are made of cells. chromosome [a line of genes; most human cells contain 46 chromosomes] Chromosomes carry the genes that make each of us different. compound [a substance containing two or more elements] A compound contains two or more chemical elements. dense [close together; thick] Lead is a dense material. electron [a small part of an atom that has an electrical force] An electron is a small part of an atom. element [one of more than 100 substances known to science that cannot be separated into other substances] An element cannot be separated into other substances. enzyme [a special kind of protein; it produces changes in other substances without being changed itself] An enzyme can change other substances without being changed itself. fetus [unborn young] A human embryo becomes a fetus after eight weeks. fission [a splitting; in atomic fission, the nucleus of an atom is split to produce nuclear energy] Nuclear fission splits atoms to produce energy. fusion [a joining together; in atomic fusion, atomic particles are joined together to produce nuclear energy] Nuclear fusion joins atoms to produce energy. genes [parts of cells that control the growth and development of living things; genes from the mother and father are passed to the child; genes contain nucleic acid] Genes in the cell control the growth and development of living things. genetic engineering [the science of changing the genes of a living thing] Genetic engineering changes the genes of a living organism. gravity [the force that pulls things toward the center] Gravity is the force that pulls things toward the center. image [a reproduction of the appearance of a person or thing] An image is a picture of someone or something. laser [an instrument that makes a thin, powerful light] A laser makes a thin, powerful beam of light. magnet [a piece of iron or other material that has a pulling force; this pulling force is called magnetism] A magnet pulls on objects of iron or steel. molecule [the smallest amount of a chemical substance that can exist] A molecule is the smallest part of a chemical substance. nerve [a thin piece of tissue that sends information through the body to and from the brain] Nerves carry information between the brain and the other parts of the body. nucleic acid [a molecule that holds the genetic information necessary for life; there are two kinds of nucleic acid: DNA (deoxyribonucleic acid) and RNA (ribonucleic acid)] A molecule of nucleic acid holds the genetic information necessary for life. |
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