| 单词 | helispheric |
| 释义 | helispheric in British English (ˌhɛlɪsˈfɛrɪk) or helispherical (ˌhɛlɪsˈfɛrɪkəl) adjective spiral spiral in British English (ˈspaɪərəl) noun 1. geometry one of several plane curves formed by a point winding about a fixed point at an ever-increasing distance from it. Polar equation of Archimedes spiral: r = aθ; of logarithmic spiral: log r = aθ; of hyperbolic spiral: rθ = a, (where a is a constant) 2. another name for helix (sense 1) 3. something that pursues a winding, usually upward, course or that displays a twisting form or shape 4. a flight manoeuvre in which an aircraft descends describing a helix of comparatively large radius with the angle of attack within the normal flight range Compare spin (sense 16)5. economics a continuous upward or downward movement in economic activity or prices, caused by interaction between prices, wages, demand, and production adjective 6. having the shape of a spiral verbWord forms: -rals, -ralling, -ralledWord forms: US -rals, -raling or -raled 7. to assume or cause to assume a spiral course or shape 8. (intransitive) to increase or decrease with steady acceleration wages and prices continue to spiral |
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