... lens 可换透镜 convertible objective 可换物镜 convertible Protar lens 可换普塔镜头 ...
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convertible telephoto objective 可转换摄远物镜
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However, that objective (price stability) is more credibly attainable under a convertible currency than a pure fiat money.
FORBES: Ben Bernanke's QE4: Another Step Toward Helicopter Money, And Away From Freedom
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