N → another name for focal point
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: 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。
It's a major focus of the Bank's work, and it might well be the principal focus of the Bank 10 or 15 years from now.
清洁能源是世行工作的一项主要重点内容，而且很可能是今后10 - 15年中世行的一项首要重点内容。
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