| 单词 | focus |
| 释义 | focus n. & v. --n (pl. focuses or foci) 1. Physics a the point at which rays or waves meet after reflection or refraction. b the point from which diverging rays or waves appear to proceed. Also called focal point. 2. a Optics the point at which an object must be situated for an image of it given by a lens or mirror to be well defined (bring into focus). b the adjustment of the eye or a lens necessary to produce a clear image (the binoculars were not in focus). c a state of clear definition (the photograph was out of focus). 3. the centre of interest or activity (focus of attention). 4. Geom. one of the points from which the distances to any point of a given curve are connected by a linear relation. 5. Med. the principal site of an infection or other disease. 6. Geol. the place of origin of an earthquake. --v (focused, focusing or focussed, focussing) 1. tr. bring into focus. 2. tr. adjust the focus of (a lens, the eye, etc.). 3. tr. & intr. (often foll. by on) concentrate or be concentrated on. 4. intr. & tr. converge or make converge to a focus. Derivatives focuser n. Etymology: L, = hearth |
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