verb集中注意力,专注于;(照相机等)调节焦距
noun焦点;(相片)聚焦清楚;(相片)不清楚
verbto give all your attention to something
verbto move part of a camera, etc. so that you can see things through it clearly
nounspecial attention that is given to somebody or something
nounIf a photograph is in focus, it is clear.
nounIf a photograph is out of focus, it is not clear.