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"Though film, microfilms, punch cards, punch tapes, type recordings, holograms, and other devices preserve a large volume of information in small space, the information on them is available to human senses only through apparatus such as enlargers, reader s, and amplifiers."

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An exception to the two-step approach is the mechanical autofocus provided in some enlargers, which adjust the lens directly.

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Hence, empirical analysis from the three mechanisms also shows that the impact of foreign trade on capital accumulation, technology spillover and institution innovation differs greatly among areas, and this enlargers China's regional economic disparity.

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Using electronic versions of brushes, filters and enlargers, these "Neographers" produce images unattainable through conventional photographic tools.

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l Screen enlargers, or screen magnifiers：(螢?zāi)环糯? l Screen readers (螢?zāi)婚喿x器)

l Refreshable Braille displays (盲人用顯示器) | l Screen enlargers, or screen magnifiers (螢?zāi)环糯? l Screen readers (螢?zāi)婚喿x器) | l Sip-and-puff systems (吹吸開關(guān))