英音 [ˈfəʊkəs] 美音 [ˈfoʊkəs]
vt.& vi. （使）集中，（使）聚集;调整（镜头，眼睛）焦点[焦距]以便看清;
"the focus of activity shifted to molecular biology"
"he had no direction in his life"
"out of focus"
"the controversy brought clearly into focus an important difference of opinion"
"the focus of infection"
"the stress was more on accuracy than on speed"
"Please focus on your studies and not on your hobbies"
"Focus the light on this image"
"The light focused"
"Please focus the image; we cannot enjoy the movie"
defocus v. 使散焦，使散开;使焦点模糊;