focal中文什么意思

adj.
1.【物理学】焦点的，(集中)在点上的，有焦点的。
2.【医学】病灶的，病灶性的。adv.
-ly

• focal distance, focal length:    焦距
• focal point, focal spot:    焦点
• a focal point:    焦点

例句与用法

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1. The focal length of the camera lens plays an important role in photo criteria .
   摄影机镜头的焦距在摄影规范中起着重要的作用。
2. The field of view can be limited by inserting a stop in the focal plane of microscope .
   可以在显微镜的焦平面上加装一光阑，从而限制视区。
3. The unsteadiness of air becomes prohibitive only if instruments with large focal length are used .
   只有在使用长焦距的仪器时，才不允许空气的不稳定。
4. The mirror of an astronomical telescope forms at its focal point an image of a star on the axis of the mirror .
   天文望远镜把在镜轴上的星体成象在焦点上。
5. The focal length of the conelensing lens should be such that the image of the source just fills the projecting lens .
   聚光透镜的焦距应使光源的像正好照满放映透镜。

英文释义

a

1. of or relating to a focus; "focal length"

形容词

1. having or localized centrally at a focus; "focal point"; "focal infection"