To calculate exit pupil, divide the aperture (in mm) by the power of the eyepiece being used.

为了计算出射光瞳，可将孔径(单位mm)除以目镜的放大倍数。

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When the wind blows the turbine produces 3.5kW of power, enough to meet nearly all the 100-pupil primary school’s energy needs and to help to heat its outdoor swimming pool to a bath-like temperature.

当海风吹过，发电机就可以产生3.5千瓦电力，彻底解决了全校近100名学生的电力需求，同时也把教室外的游泳池加热到适合沐浴的温度。

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They also argue that they could all see an increase in pupil numbers if a new nuclear power station is built at Wylfa.

BBC: Anglesey schools: Closure plans move a step closer

Education Secretary Michael Gove said he was "protecting the frontline, handing power to teachers and introducing a pupil premium for the poorest" - but the "size of the deficit means we have had to make tough decisions".

BBC: What will cuts mean for education?