| 单词 | radius |
| 释义 | radius (once / 1887 pages) 1n 2n If you're a detective working a crime investigation, you might be told to "search over a one-mile radius," meaning, scope out everything that's within one mile of the crime scene. The radius of a circle is the distance from its center to the circumference, and if you are working on your geometry homework, or designing anything circular, you'll be writing down a little "r" quite frequently, to stand for "radius." It's also the name of one of the bones in your forearm. WORD FAMILYradius: radii, radiuses USAGE EXAMPLESBut bubbles with a radius of 1.7mm across resulted in the highest number of droplets evaporating at the surface of the drink. The Guardian(Dec 23, 2016) I’ve got three of my favorite cinemas in that radius. New York Times(Dec 22, 2016) A mainstay of the industry, the business involves delivering gas by truck to customers within a radius of a few hundred miles. Wall Street Journal(Dec 20, 2016) 1 1n a straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere) Hyper straight line a line traced by a point traveling in a constant direction; a line of zero curvature 2n support consisting of a radial member of a wheel joining the hub to the rim Syn|Hyper spoke, wheel spoke support any device that bears the weight of another thing 3n the length of a line segment between the center and circumference of a circle or sphere Syn|Hypo|Hyper r semidiameter the apparent radius of a celestial body when viewed as a disc from the earth radius of curvaturethe radius of the circle of curvature; the absolute value of the reciprocal of the curvature of a curve at a given point length the linear extent in space from one end to the other; the longest dimension of something that is fixed in place 4n a circular region whose area is indicated by the length of its radius 2they located it within a radius of 2 miles Hyper part, region the extended spatial location of something n the outer and slightly shorter of the two bones of the human forearm Hyper arm bone a bone in the arm |
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