| 单词 | boundary |
| 释义 | boundary (once / 276 pages) n If you play a sport you are familiar with the term "in bounds," which refers to the boundary, or limits of the playing field that the players must stay within. It is also the outer limits of any space. A boundary is a border and it can be physical, such as a fence between two properties, or abstract, such as a moral boundary that society decides it is wrong to cross. If you have no sense of boundaries, you probably annoy people sometimes by getting too close to them or talking about inappropriate topics. Gustave Flaubert once said, “Earth has its boundaries, but human stupidity is limitless.” A boundary is basically what limits us. WORD FAMILYboundary: boundaries+/bound: boundary, bounded, bounder, bounding, boundingly, boundless, bounds, inbound, rebound, unbound/bounded: boundedness, unbounded/bounder: bounderish, bounders/boundless: boundlessly, boundlessness/rebound: rebounded, rebounding, rebounds/unbound: unboundedly/unbounded: unboundedness USAGE EXAMPLES“What Vladimir Putin needs is a sense of new boundaries,” Sen. Tom Cotton, Arkansas Republican, told “Fox News Sunday.” Washington Times(Jan 01, 2017) “What Vladimir Putin needs is a sense of new boundaries,” the senator said. Washington Times(Jan 01, 2017) “Setting clear boundaries and expectations with family and friends, and clearly communicating these is an essential part of the change process,” he says. Seattle Times(Jan 01, 2017) 1n the line or plane indicating the limit or extent of something Syn|Exp|Hypo|Hyper bound, bounds Rubicon the boundary in ancient times between Italy and Gaul; Caesar's crossing it with his army in 49 BC was an act of war Mohorovicic discontinuitythe boundary between the Earth's crust and the underlying mantle Green Linethe border marking the boundaries of the land that Israel won in its 1948 war of independence Line of Controla 450-mile line that is supposed to indicate the boundary between the part of Kashmir controlled by India and the part controlled by Pakistan Mason and Dixon's linethe boundary between Maryland and Pennsylvania; symbolic dividing line between North and South before the American Civil War Triple Frontierthe border area where Argentina and Brazil and Paraguay meet; an active South American center for contraband and drug trafficking and money laundering; a suspected locale for Islamic extremist groups hairline the natural margin formed by hair on the head frontieran international boundary or the area (often fortified) immediately inside the boundary heliopausethe boundary marking the edge of the sun's influence; the boundary (roughly 100 AU from the sun) between the interplanetary medium and the interstellar medium; where the solar wind from the sun and the radiation from other stars meet border, borderline, boundary line, delimitation, metea line that indicates a boundary bourn, bournean archaic term for a boundary district linethe boundary between two districts county linethe boundary between two counties city linethe boundary of a city border, edgethe boundary of a surface enda boundary marking the extremities of something demarcation, demarcation line, limitthe boundary of a specific area lineation, outlinethe line that appears to bound an object surfacethe extended two-dimensional outer boundary of a three-dimensional object shorelinea boundary line between land and water edgethe outside limit of an object or area or surface; a place farthest away from the center of something interface(chemistry) a surface forming a common boundary between two things (two objects or liquids or chemical phases) hard palatethe bony part of the roof of the mouth palate, roof of the mouththe upper surface of the mouth that separates the oral and nasal cavities face, sidea surface forming part of the outside of an object circuit, circumferencethe boundary line encompassing an area or object fence linea boundary line created by a fence property linethe boundary line between two pieces of property state boundary, state linethe boundary between two states brinkthe edge of a steep place celestial sphere, empyrean, firmament, heavens, sphere, vault of heaven, welkinthe apparent surface of the imaginary sphere on which celestial bodies appear to be projected city limit, city limitsthe limits of the area occupied by a city or town endthe surface at either extremity of a three-dimensional object inside, interiorthe inner or enclosed surface of something limb(astronomy) the circumferential edge of the apparent disc of the sun or the moon or a planet upper limitthe limit on the upper (or northernmost) side of something lower limitthe limit on the lower (or southernmost) side of something coastlinethe outline of a coast silhouettean outline of a solid object (as cast by its shadow) exterior, outsidethe outer side or surface of something skylinethe outline of objects seen against the sky substrate, substratuma surface on which an organism grows or is attached three-mile limitthe limit of a nation's territorial waters wave front, wavefront(physics) an imaginary surface joining all points in space that are reached at the same instant by a wave propagating through a medium photospherethe intensely luminous surface of a star (especially the sun) extremity the outermost or farthest region or point 2n a line determining the limits of an area Syn|Hypo|Hyper bound, edge rim the shape of a raised edge of a more or less circular object border, margin, perimeterthe boundary line or the area immediately inside the boundary fringe, outer boundary, peripherythe outside boundary or surface of something brink, threshold, vergea region marking a boundary upper bound(mathematics) a number equal to or greater than any other number in a given set lower bound(mathematics) a number equal to or less than any other number in a given set thalwegthe middle of the chief navigable channel of a waterway that forms the boundary line between states lipeither the outer margin or the inner margin of the aperture of a gastropod's shell line a length (straight or curved) without breadth or thickness; the trace of a moving point 3n the greatest possible degree of something Syn|Hypo|Hyper bound, limit knife-edge a narrow boundary absoluteness, starkness, utternessthe quality of being complete or utter or extreme heat barrier, thermal barriera limit to high speed flight imposed by aerodynamic heating level best, maximum, utmost, uttermostthe greatest possible degree brink, vergethe limit beyond which something happens or changes extent the distance or area or volume over which something extends |
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