| 单词 | focus |
| 释义 | focus —focusable, adj. —focuser, n. /foh"keuhs/, n. , pl. focuses, foci /-suy, -kuy/, v. , focused, focusing or (esp. Brit.) focussed, focussing. n. 1. a central point, as of attraction, attention, or activity: The need to prevent a nuclear war became the focus of all diplomatic efforts. 2. Physics. a point at which rays of light, heat, or other radiation, meet after being refracted or reflected. 3. Optics. a. the focal point of a lens. b. the focal length of a lens. c. the clear and sharply defined condition of an image. d. the position of a viewed object or the adjustment of an optical device necessary to produce a clear image: in focus; out of focus. 4. Geom. (of a conic section) a point having the property that the distances from any point on a curve to it and to a fixed line have a constant ratio for all points on the curve. See diag. under ellipse, hyperbola, parabola. 5. Geol. the point of origin of an earthquake. 6. Pathol. the primary center from which a disease develops or in which it localizes. v.t. 7. to bring to a focus or into focus: to focus the lens of a camera. 8. to concentrate: to focus one's thoughts. v.i. 9. to become focused. [1635-45; < L: fireplace, hearth] Syn. 1. center, heart, core, nucleus. |
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