| 摘要 |
A reading teaching aid comprising two substantially coplanar masking elements each of which defines at least one edge of a viewing area, said elements being carried on the respective first ends of a pair of elongate arms which are resiliently hinged together at their second ends, each of said elongate arms having finger reception means adjacent said masking elements which include a substantially horizontal portion and an upstanding portion to allow said masking elements to be pressed onto a supporting surface and moved towards and away from each other against the resilience of the hinge to vary the dimensions of the viewing area.
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