Focus on an area of sky where the fireworks will be, or on an object the same distance away.
可以对焰火即将绽放的那片天空对焦，或者找个与烟花相同距离的物体进行对焦。
Media theories of distance education: element, assistance or focus?
远程教育媒体理论：要素，辅助，还是中心。
A distance setting, as on a camera, beyond which the entire field is in focus.
无限远标志一个距离的设定，比如在照像机上，表示整个场景都在焦点内。
专注于距离，而不是速度。
Focal length: The distance between the centre of a lens and its principal focus.
焦距：镜头中心与其主焦点的距离。
Results The distance between focus point and end face of crystal is calculated.
结果计算出了焦点位置与晶体端面的距离。
Focal length is the distance between optical centre and principal focus.
焦距就是镜片中心和焦点之间的距离。
Focal length is the distance between optical centre and principal focus.
焦距就是镜片中心和焦点之间的距离。
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