(pl. focuses 或foci /ˈfəʊsaɪ/)
1
- the centre of interest or activity兴趣（或活动）的焦点：
this generation has made the environment a focus of attention.
这一代人使环境成为关注焦点。
1.1
- an act of concentrating interest or activity on something重视：
our focus on the customer's requirements.
我们对消费者需求的重视。
1.2
- Geology the point of origin of an earthquake【地质】（地震的）震源, 震中。比较EPICENTRE.
1.3
- Medicine the principal site of an infection or other disease【医】病灶。
2
- mass noun the state or quality of having or producing clear visual definition图像（成像）清晰度：
his face is rather out of focus.
他的脸有些模糊。
2.1
- another term for FOCAL POINT.
2.2
- count noun the point at which an object must be situated with respect to a lens or mirror for an image of it to be well defined成像清晰点。
2.3
- count noun a device on a lens which can be adjusted to produce a clear image（透镜）调焦装置。
3
- Geometry one of the fixed points from which the distances to any point of a given curve, such as an ellipse or parabola, are connected by a linear relation【几何】（椭圆、抛物线等曲线的）焦点。
(focused, focusing 或focussed, focussing)no obj.
1
- (of a person or their eyes) adapt to the prevailing level of light and become able to see clearly（人, 眼）调整视力以看清楚：
try to focus on a stationary object.
设法调整视力以看清楚一静物。
1.1
- with obj. bring (one's eyes) into such a state调节（眼睛的）焦距：
trying to focus his bleary eyes on Corbett.
设法把他模糊的视线集中在科贝特身上。
1.2
- with obj. adjust the focus of (a telescope, camera, or other instrument)调节（望远镜、照相机等器械的）焦距：
they were focusing a telescope on a star.
他们正对着一颗星调节望远镜焦距。
1.3
- (of rays or waves) meet at a single point（光线, 波）聚焦。
1.4
- with obj.(of a lens) make (rays or waves) meet at a single point（透镜）使（光线, 波）聚焦。
1.5
- no obj.(of light, radio waves, or other energy) become concentrated into a sharp beam of light or energy（光, 无线电波等）集中成束, 聚焦。
1.6
- with obj.(of a lens) concentrate (light, radio waves, or energy) into a sharp beam（透镜）使（光, 无线电波等）聚焦。
2
focus on
pay particular attention to把注意力集中于, 重视：the study will focus on a number of areas in Wales.
该研究将重点针对威尔士若干地区。
2.1
- with obj. concentrate集中：
the course helps to focus and stimulate your thoughts.
该课程有助于集中并激发你的思维。
2.2
- with obj. Linguistics place the focus on (a part of a sentence)【语言学】以（句子的一部分）为焦点（或重心）。
派生词
focuser
noun词源
mid 17th cent. (as a term in geometry and physics)： from Latin, literally 'domestic hearth'.