In addition, several devices can be combined to achieve uniform lighting over large areas. The small device can be attached to clothing with a magnet, for example, or mounted on a tripod with a 1 ...
PUPIL: As well as the small triangle and the big triangle, there is lots of other sizes to count. CHRIS: So how many like that can you find in there? There must be a few. PUPIL: It might help to ...
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